Sounds like they're trying hard to impress. That combined with them registering to post here (I imagine they found it via a Google search or something) says good things about them.
But their prices were pretty steep. I'll be getting a new rig in the next 2-3 months and pricing for the components was exceeding $1,000 before shipping. Current pricing on DIY was something between $780-$830, less than that if you don't count Windows. That's a pretty steep mark-up.