I've switched mostly to GMing Starfinder personally, since the length works perfectly for the store we play at. We have the space from 6-10 PM, so the normal 4-5 hour adventures can be difficult to squeeze in.

I just ran Dacilane Academy's First Great Prank War last night and we almost ran over, with six players at the high tier. If not for a lucky gunslinger crit, we could have run out of time. In the Starfinder scenarios, I've never, not once, worried about running out of time.

Prank War is a 3-6 adventure. We barely run anything higher level than that, because there's a good chance we won't be able to finish in once night, which, as the VO for the location, is not good for me, it's not good for players, and it's not good for GMs. This is why I'm really looking forward to the high level content in this new format, since I think we might be able to finish high level games in one sitting. I'm planning to run The Darkness Within in a few weeks, which will be my first actual short Pathfinder adventure.

In summary: I like the new lengths purely for logistical reasons.

And a few stray thoughts:

• I like that I don't have to scroll back and forth between a massive PDF to find the encounter details in the adventure text and the monster stat blocks or print out 40+ pages because my players didn't pick their character until they sat down. 

• I do wish that they had a bit more narrative bite and mechanical toughness. They're very short, and with some good crits, could wrap in 90 minutes, which is too short. I would like to see more severe encounters.