I have an S5, because I'm a sucker.
I went looking around one day at Best Buy, and to some personal circumstances, needed to get a new phone. I was teased in by some Samsung reps, and ended up walking out of the store with a Samsung Gear Live watch and an S5. Honestly, the S5 isn't that bad of a phone and the watch does everything I expected it to, but I just feel like I could have done better.
I could have gotten a Nexus, which are pretty good phones. They also are easy to mod, so I could end up running Cyanogen on them. If I really wanted to, I could get Ubuntu on it, too. At the same time, there's a lot of phones that seem better, but the S5 hasn't been bad to me. I still feel like I could have done more research, though. I kind of miss my G2.