I'm using this device since 2 month ago, for the scores I definitely consider the price of the device, bear in mind that it's even cheaper than HTC Radar but higher spec, obviously there are some issues with this device:
1-For the back panel sometimes you feel it's not completely attached to the body, I mean there is a tiny space (may be some micro-meters) between it and the actual body, specially on the edges which is a bit annoying in the hand.
2-I like the curve design of the back and it's very comfortable in hand but it would be better if the device was thinner.
3-Some of my friends using WP devices with capacitive buttons complain that sometimes unintentionally they touch the buttons in the middle of games or any other app they were using, but I think that issue would fix after you get use to the device, but with Lumia 710 the buttons are resistive and although at first they may seem useful but after a while I wish they were capacitive, because sometimes it's hard to interact with them
4-Obviously the front facing camera is another issue
But despite this issues I'm quite happy with the device and I think it's one of the main players for it's competitors in this range.