I think it's still a nice performing device, but I had two that had a charging issue. One I used warranty roulette, and the used one they sent me developed the same problem. The USB ports went bad. Considering that's the only way to charge the phone and I've now had two with the same issue, I no longer recommend it. Once the port goes out, it's dead in the water.
The camera on the M8 wasn't half bad. Unless you were planning to make large prints or a lot of zooming/cropping, the resolution isn't much of an issue. It had great color clarity and low light performance, and I thought the duo effects were fun to play with.
I upgraded to the LG G4 and have been pleased so far with it. I like LCD screens, sd card support, and removable batteries. The G4 has it, an awesome camera, actually doesn't feel as big as it is (I don't like phablet sizes), and Verizon had a killer deal on it. People have been able to combine three offers that basically paid then $46 to get it.