Hexus posted a review on the Qnap TS-251A
A quote from the article:
The two-bay NAS that doubles as a USB drive. Mainstream network-attached storage (NAS) solutions have evolved to such an extent that consumers can today pick from a wide range of affordable options knowing that the essentials - backup, media server, printer sharing and download client - will likely be taken care of with little fuss.Qnap TS-251A Review @ Hexus
The likes of Synology, WD and Qnap are among the first brands to come to my mind, and if you're looking for a NAS that touts a little extra in terms of innovation and feature set, it's Qnap who tends to stand out from the crowd. In addition to offering a vast portfolio of traditional NAS solutions, the Taiwanese manufacturer has developed a taste for innovative features, unique form factors and varied usage scenarios.