6.5 stock rom is great but lots of bugs for sprint to fix. my experience 6.5 was great until when your goes into sleep mode and it doesn't wake up for like a few minutes which is a pain for me and it's sporadic at times when it does it and its constant. seems like its not a big deal but it annoyed the heck out off me and having to manually do a reset alot. try the rom out and see for yourself if you like it good. if you don't revert back to 6.1 or go custom