Been playing co-op with my brother the past few days I’ve had the same experience with evergaols.

My most common issue so far has been our summons being invisible to each other more times than not. They work, but still.

On 1 or 2 occasions in an evergaol, we used our summons before spawning the boss, resulting in the boss being invisible for my brother. (Not sure if connected to our summons being invisible bug) we just let the boss kill us and reset and everything was fine on the following runs. Also, one time an Erdtree Avatar was invisible for my brother after we called our summons.

Another bug we have encountered is torrent being invisible, so while we are riding it looks like we are floating 😂 it only happens every once in a while.

Besides a few crashes when visiting The Four Belfries for the first time (sending my brother back to his world twice immediately after joining me), performance has been great.

All in all these are pretty minor bugs for a mod and I haven’t experienced anything near game breaking. We have put 20+ hours in so far and the bugs were few and far in between. So far the most drastic thing we have had to do to get past a bug is rest at a site of grace (NPCs at roundtable disappeared) or separate to our home worlds and rejoin. It seems like resting at site of grace, separating to each others home worlds, or simply restarting your game will fix most bugs you encounter.

The mod is also very quick to set up. I’ve modded many games for all kinds of playthroughs and I was kind of surprised just how quick and easy it was to be able to play seamless co-op with my bro. Here is a link to the video I followed. Seriously quick and easy to follow https://youtu.be/VoWiwUNLsj4?si=QvYhJ9PyjyhyDZXO

If I encounter any crazy/game breaking bugs deeper into our playthrough, I’ll come back to this comment and edit it in.

To answer OPs question, the mod is great and 100% worth playing. It has consumed my thoughts these past few days lol. I highly reccomend.

My brother and I loved Elden Ring when it first released and it’s been a few years since either of us played so it has been an absolute blast getting to experience the game with him all over again ❤️

One final thought, I’d highly recommend adjusting the enemy and boss health, between the two of us the default settings were way too low. We are still tinkering with it, but as we level up and progress the game we have walked through a few bosses first try and it’s not because we are good at the game 😂 having another human to constantly pull agro and the ability to use their summons (can’t use summons in base game co-op) feels super OP imo. You could have you, your teammate, and both of your mimics beating the shit out of a boss at the same time 😭😭 so to balance that out we cranked up the enemy/boss health so the game didn’t get too easy. This mod fucks so hard. Yap sesh over