I got one off Amazon on sale for around $90. I really wanted to like it, but I ended up returning it because:
1. The phone wouldn't physically seat/connect with my case on. I have one of the thinnest cases Spigen makes, so they obviously weren't considering cases when making this thing. That means I had to take my case off to use it, and that's a pain.
2. The Remote Desktop client for Android--which works great on the phone--would not go fullscreen in the Dex, rendering it useless on the desktop. That's unfortunate because, if I could remote into my Windows boxes, the phone doesn't have to be much more than a thin client + a browser/audio/video player (which, incidentally, I think it did a good enough job of).
3. Kind of a nitpick, but when you pull the thing out of the box and look at it, it's just begging to be a wireless charger--but it doesn't have wireless charging capabilities. For the price, this seems like a miss.
So I'm in the "has potential, but not quite there yet" camp.