I had a One M7. I bought it largely because it promised good low light camera performance. My phone was one of many with a flaw that cast a purple haze on low light photos, rendering it nearly useless in low light. Foolishly I waited awhile in hopes that a software update would fix it.

HTC offered some sort of replacement program but that would require me to go without a phone for weeks.

Eventually Verizon sent me a replacement unit whose camera was even worse. I decided my next phone would be an iPhone. I now have the 6 Plus and it's the best point and shoot camera I've ever had, period (even counting standalone cameras.) If something goes wrong with the phone I know I can go to an Apple retail store and get it fixed or replaced immediately, not in weeks.