I'm using Mate35 (first post, can't link, try googling), developed by PlayfulGod. It's a modded stock ROM, and works great. Very responsive with some cool tweaks. I'm pretty new to all of this; the M835 is my first smartphone and my first foray into the world of Android. I've got some Linux experience, which helps. Seems like the activity surrounding the M835 on these forums has died down since the end of last year, but there's a wealth of comprehensive information to be found. Let me know if you have any questions and I'll do my best to help. I've been playing with it for the last month or so.