I've also been using it for a few months and I tried a restore. What I found out is that the large zip files they create don't work. They warn you about creating zip files over a certain size, but I tried it anyway. I couldn't get it to unzip successfully on Mac OS X or Solaris using a variety of programs.

I'm also skeptical of their data integrity. From reading about there setup it seems that they have no checksumming and their only redundancy is RAID. So bad blocks or multiple disk failure could cause data loss. It's still worth it for my because it's so cheap, but I wouldn't make it my only backup.