Thought I'd share this for what its worth. I flashed TWRP and played around with the 11s for awhile, then updated to OxygenOS and honestly was NOT impressed at all. I flashed MultiROM and (just in the past week) downloaded 6 of the top-rated Lollipop ROMs available, starting with CM12 nightlys, then switching to Euphoria, Exodus, Slimpop and Liquidsmooth. They got better (respectively) but being a risk taker, I decided to push the envelope and am so glad I did. I'm currently using Blisspop 5.1 (official) as my primary rom and I must say, it is incredible. I spent about a day with each and IMHO this is the best ROM available and is very, very stable. Unbelievably customizable and performs nicely with no bugs of lags. I know I'm off topic and a long winded but I had to share my experience and hopefully save 'someone' some time and energy, so you can get the most out of this phenomenal device. Just follow the install advise carefully and you won't have a problem, flashing recovery was the hardest part. Anyway, that's it, so enjoy people.