I bought one of these several months ago and it has worked flawlessly. With its small footprint, integrated 7-port switch and RedHat OS, I think it is well worth the price.
There is a great user-group at http://groups.yahoo.com/group/magnia_sg10/ There are a couple of different OS's people have loaded on theirs, but I use it nearly stock with webmin server software to admin the box. While it is not the most powerful unit out there, it does everything I have asked it to do and fits easily in my electronics closet at home and is VERY quiet. It is about the size of a bookpc, but Toshiba has done a great job of engineering and it looks like it should be part of a hi-tech A/V setup.
If you are looking for a home or SOHO server, I can't recommend this one highly enough. Comes with MP3 server and PhotoFrame software preinstalled from Toshiba, plus an intranet sight already built. It also has a pre-installed net-cam monitoring software for the Axis network cameras. Overall I would rate it an 9 out of 10. My only complaint is the distro of RedHat could have been more recenty. (It is 6.1.2 installed)