Bought mine from Comet (of all places!) a few weeks ago. Had the same issues as everyone else - no reviews, Samsung not even listing it etc. Took a leap of faith and haven't been disappointed - the set is fantastic especially considering the sub £600 price. Picture quality is great, sound is more than good enough and it's got every connection you could need.
The USB connections work really well if you want to hook up a USB key/drive to play your movies. I also have mine linked up over the Ethernet connection to one of my PCs running Windows Media Player (XP SP3/WMP11) as a DNLA server to stream my movies across - works really well. Via USB or DNLA streaming it plays 99% of my movie files without a hitch (MP4, DivX, Xvid, MPG, MKV, WMV) plus my audio files and pictures too. I've only had the odd one or two come up as unsupported which isn't surprising - nothing supports 100% of files! The interface is OK - it could be a little more flexible if I'm being picky but it does the job just fine. If you have large amounts of files it can take a while to list them and if you have very large amounts listed in one directory/genre/actor etc then it occasionally gives up reading them all and says there's nothing there. Split them up a bit into sub genres etc and it works every time. Works better than my old Pinnacle Showcentre and saved me buying a Acer Revo to use as a Movie streamer. BTW if you run Media Player on Windows 7 you can even push a file/playlist onto the TV from your computer, rather than using the TV pull it from your machine. If you push the file it takes over the TV regardless of what is on the TV at the time - perfect for winding up members of your family when they are in the middle of Eastenders! ;-)
All in all well chuffed with it and would recommend it to anyone.