I've been really happy with the phone. My concern with buying it was battery life but it's rarely been a problem, and when it is, I can top it off in 20 minutes with a quick charger. Only other thing I've noticed is an ad heavy site on chrome can tax the CPU.
And AT&T living up to it's crappy reputation yet again... No update to 6.0.1 yet, still on the Nov. 2015 security update level. I'm glad I didn't buy this phone, it was free through my employer.