I was actually sent the TL-WN721N instead of the WN727N pictured above. However, I've been using it for a couple of weeks now on the Linux Ubuntu 10.10 with a Gnome 2.x Desktop. It has been working fine in maintaining the network connection. The wireless stick itself does not get too warm, and is robust enough for general use, though I would not want to see it trodden on!
Appears to be good value for money. I would recommend it to anyone using Linux who is using a reasonably up to date kernel (2.6.35 onwards). I also tested it on Vector Linux 7 Live CD, which runs the latest 3.x kernel, and it picked up this wireless usb stick and made a connection just fine..