This may be the best 6" reader I've ever used. It's definitely the lightest and the thinnest yet it doesn't flex. Seems to be really well built. The screen lighting is among the best. We all are already familiar with Onyx software so no surprises there.
For reference, I have a Kobo Clara HD, Kobo Glo HD, Kindle Voyage, Kindle K3, Boox Poke (not pro) and a couple of inkbooks and I've had a Boyue, and a paperwhite in the 6" size.
Things I really like about the new Poke; the power button has a positive click feel, not a mushy push and it's located on top! That's a plus in my book.

The back cover is a soft-ish plastic that's fairly grippy, at least it's not too slippery anyway. The already mentioned lightness and thinness and of course, being Android you can install other reader apps.
Anything I don't like? Well, the included case/cover, which is also incredibly light, is the stick-on style so it's not a simple act to install and remove anytime you want.
So far, I really like it and am glad I got it.