For 6 quid I wasn't expecting much, and that's pretty much what I got :-) The remote is okay, but only a few of the basic buttons work on my setup. I've tried it against XBMC and MediaPortal and only get the cursor + numeric + a few other keys to work.
Checking what is being received on the PC using an app called CheckScanCode showed that buttons (like Play and any of the media-type buttons) don't even register. I guess they're being intercepted different. That means that you can't map them up in whatever app you're using.
It's a shame there is no driver software or anything to help map up these other buttons in any way (unless anyone knows of some s/w?).
Other people are reporting that all buttons work, but out of the box they definitely don't for me with XBMC or Media Portal (even in HID mode). That's on Win XP SP3.
In the end I remapped numeric keys to functions such as play, pause, etc. Not ideal, but acceptable for 6 quid.