Why or in what circumstances people should choose you over, for example, Rackspace or cloud vendors like EC2 might be a good place to start.
Exelion's Basic model includes an incredibly fast Xeon processor, 16 GB of RAM, RAID 1 storage and a gigabit port for $99 per month ($66 per month with 5 year commitment).
Compare that to Rackspace which I'm guessing would charge about $1 billion per month for the same thing although I haven't checked their prices lately. In all seriousness - Rackspace can't come close to their pricing.
Other than that, there are still some open questions - where are they located, how can we be sure they'll still be in business a year from now, or hey, what operating systems they support, etc.
And he financed it with his bitcoin winnings, I guess.
Anyway, my point is exactly that you say "anyone who has evaluated Rackspace." The OP doesn't make claims one way or the other, and if I don't have my own claims I'm willing to evaluate using his service, there's no call to action (I can't believe I just used that phrase).