I bought one at $299. Replacing my M9 that seems to get hot even when I'm not doing much. I think that the heat causes the CPU to throttle and the battery to run down faster because it sure doesn't seem to last long any longer. That's just my guess..
Anyway I don't play games, so the 617 processor has been great. Cool running, nice bright clear screen (I think it's much brighter then the M9) and snappy performance. Battery is acceptable because I have a couple opportunity to charge if need to. Today it went from 60%-95% in 35 minutes on a QuickCharge 2 car charger. It's also substantially thinner and lighter then the M9 its replacing.
All in all, at $299, I think it was a very good deal.