Summary: I would have given 4 stars unless this NAS stopped working after two months of operation. All of a sudden, it stopped working... who expects a NAS (not a HDD in it) stops working after only a couple of months? ..I was surprised this could be happen even to a 'initially perfect' device. And instead of replacing it, I had to have it repaired though it is nearly a new one. Besides, this is one of the best NAS in the market, considering all the functionality for the price.
Summary: Qnap seems to be way more interested in stuffing in new features, and trying to make the web interface even more "pretty", than fixing dozens of serious stability and security problems their users have been complaining about release after release. Their priorities seem to be very wrong for something as critical as a NAS and the integrity of your data.