I went back to ios 9.3.3 yesterday because of the MMS issue with iMessage. I read it got fixed, so I reinstalled ios 10 beta 1 this morning. The MMS issue IS fixed, but for some reason, this new reinstall of ios 10 beta is buggier than ever. The text messages have the wrong names and pictures, there's a delay when unlocking the phone and the wallpaper appears like 1 second later, it's just a messy install.
It's unfortunate because my previous install of ios 10 beta was smooth as butter and bug-free. I'm gonna have to reset all settings and I really don't want to. So I'm hoping beta 2 comes out today otherwise I am seriously done and going back to 9.3 and calling it a day.