If I am correct, their servers are in the RackSpace data center. One of my friends had a virtual hosting account with them, but I do not know anybody personally who has a dedicated server with them. (Don't register your domain name through them though).
My friends experience with them was good, and tech support was decent. The problem is, you do not get control over your domain name, you must email them to make any nameserver, or contact info changes. It's also not listed under your email address (just your name, their email address). I'd stick with something like GoDaddy.com or NameBargain.com