There's way not enough information in that post. It doesn't mention *anything* about how it's configured. Which processors, how much RAM, drive types/sizes, RAID controller, etc, etc, etc. I would be very careful. It could be a really good deal though if you need that much machine. I would never pay full price for one.
There is a lot of spec info in the link, but there is no config details. And there is no way I would even think of buying a computer on line without first seeing and testing it. It is possibly a very good deal, but I also don't need it. With something like this you'd want a proper connection, not woohoo lighting fast DSL
Actually the link is a generic link that says machine capabilities (e.g. 256MB-2GB of RAM). It doesn't specify what the specs of the machine in question is as currently configured. As far as you know, it doesn't even come with processors.