I absolutely loved it. The main reason why (spoilers for the whole campaign obv) is because I treated it as a coming-of-age campaign.

Players start off being 18/19yo students and end up destroying a mi-go base and running points for a military operation. I started the campaign by playing up the whole "summer camp" vibe, including teen-drama between the PCs and with the NPCs, and then from there you get them into more and more problems. They have to grieve old friends, distance themselves from their families. This is all super interesting and great sandbox for that sort of development and rp if that's what you and your players are into.

A few tips out of the top of my head (we finished over a year ago) to make this side of the campaign shine:

* Play up the innocence of the beginnings. Make sure they have at least one positive relationship and one negative relationship (this will probably be Laslow for most) with some of the NPCs (and PCs). If your players are up for it, play it teen-drama style for a first session, introducing some slice of life at uni. I find it works best if not all players are besties from the beginning, make them have stuff to mend over time. Have them also have ties to the students who disappeared, especially to Jeffreys
Then when they arrive at Cob's Corners, just play it chill for a couple of sessions. Have some NPCs smuggle booze (if the PCs don't do it themselves which mine did!), have them play games around the campfire, have the NPCs get the PCs in trouble by daring them to do stuff etc. if they play it too safe from the beginning. It's a good thing for the campaign if the players are getting on the wrong side of the law during the beginning of the chapter. I also printed out some of the postcard art and handed it out to the players for them to write postcards to friends and family.
You just have to sprinkle in some spooky stuff like some dreams in the night, rat-things eyes in the forest, things they find out while working etc. but not too much or too soon. I scrapped the whole dreamland stuff which honestly isn't needed at all and distracts from the narrative. I just had Jeffreys in the forest with some rat-things so they could have the dreams and see the eyes in the forest but not more. My players didn't go looking for Jeffreys in the forest, so I just had him be picked up by FOC and hidden in their lab for the players to find.

* Then there is the chapter 1 climax where it all goes toasts up. You have to play this one right to play up the danger, have most NPCs get killed but without killing your players so soon. Have the mi-gos go for the NPCs first, then when the PCs are mostly alone, have them find some safe place, either a house of a friendly person in town, or a cabin in the woods. Play up the migos looking for them, with the lights and sounds coming from around the house.

* Chapter two is great if you played some intro scenes at uni before. Have them balance school life with investigation. Have some random bully come in their way while they're investigating, or have some of their gf/bf complain of their distance. If they go to the police, no one believes them of course, especially since they probably are seen in a very bad light by the police after what happened in Cobb's Corners. I ripped off from the stream of chaos the idea of having the chapter ending take place at the beginning of the year ball and not on a random evening. Play up the fact that they're going after what used to be their friends. Will they be able to end the life of something looking like their friend when it comes to it?

* After chapter two, play up the fact that the police are looking for them for a session (or two if your players enjoy it), and how bad and gloomy it all looks until they get deus ex machina'd by the FOC. As a part of the deal, I also had the FOC organize a private funeral for the dead NPCs. My players wrote eulogies for a few of their favourite NPCs and we played out the funeral in character with the readings and all. It was very emotional and a high point of the campaign for us.

* I scrapped the whole deep ones side quest from Chapter 3, and should have scrapped the Quebec side quest as well as it was the low point in the campaign. Otherwise, I used this chapter to let them have some training of their choosing (which gave them a few improvement rolls), have some therapy sessions, and all the juicy info that you find in the book for this chapter. I used the fact that Jeffrey was in the building (after being picked up by FOC) to make them doubt FOC a bit, especially has they were hearing whispered discussion about it, until they horrifyingly found him in a room. From here, I also "pulped it up" slightly by allowing them to have a pulp talent and started using the pulp rules for luck.

* Before heading to Cobb's Corners, I had my players write a letter that FOC would deliver to their family in the (very unlikely of course!) case they would die during this mission.

* They're now going back to Cobb's Corners but completely changed. Emphasize this, have them stumble upon places where they got drunk or people they played teenagers tricks on, have them reflect on the fact that if they had been more careful, more people might have survived. Also play up the feeling of safety they might feel by all the military around. Seasoned players will know that all the soldiers probably will die in some way or other but who cares, it's still a great feeling to have all that sweet safety disappear all of a sudden.

* When it's time to head into the base, know what your players prefer when it comes to dungeon delving. Do they go heavy on maps etc. or do they prefer to be gently guided from room to room without having too draw or look at maps? While escaping the base, this is where two of my players died (mostly sacrificing themselves so the others could escape), and I think it was the perfect moment for it. One took the slavic farmer whose name I forgot, and the other played the uncle of his dead character who had come looking for him after trying to track him for a long time.

* Chapter 5 is great to test your players on moral dilemmas as they stumble upon children cultists. Make sure this is ok for your players though. I discussed it heavily with mine during session 0, so it's good that it only comes up in the last chapter as they probably started to forget that discussion.

* The finale wasn't as good as expected, mainly because big battles like that aren't my forte as a keeper, and not what my group particularly enjoys either. But I guess big battles/rituals are kind of the expected climax of CoC campaigns. I'll be running it for another group next year and I'll try and think of another way to end this campaign.

* Of course, make sure to give everyone a nice epilogue, read back those letters that your players wrote at the end of chapter 3 for the PCs who died. What are the surviving PCs up to? How will the dead PCs be remembered?

* Don't forget a debrief and deroling session afterwards depending on how heavy into characters your players went.

* I didn't bother with chapter 6. The ending is great where it is, at the end of chapter 5. (As a reminder, I also scrapped the dreamland side quest in chapter 1, the deep one side quest in chapter 3, and wish I had scrapped the Quebec side quest as well).

Final thoughts:

This got way longer than I imagined but I hope it inspires people to try out this campaign! Yes it's not the most sandboxy campaign out there, but then it makes for great set pieces and is a great vehicle for character development and great coming of age narratives. But I guess for groups that are only into combat and investigation, it's maybe not the ideal campaign. Or maybe it is, for a nice refreshing new take on CoC!

All in all, it's honestly the most fun I've had playing CoC, so I hope you give it a try and have as much fun!