Western Digital ShareSpace and other NAS

I’m considering getting this NAS from Western Digital. They have the 8TB ShareSpace on Linux with their media software called Twonky.

Any opinions from users?

http://www.wdc.com/en/products/Products.asp?DriveID=584

http://www.smallnetbuilder.com/content/view/30586/75/
Good price but very slow…

A much better choice if you can do some work on your own is this one…

http://www.provantage.com/intel-ss4200ehw~7ITE901P.htm