I am a current customer.  I sent them my servers in April, about 40TH.  So far they have been "slightly" more expensive than running the servers myself, but with less billing issues from the electrical company.
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They run the servers on Eligius, so you can watch your page and let them know if there are any oddities.  You have to give them the server passwords so they can set up the machines in their data center and do the reboots after power outages.  You can't really visit the data center, as Churchill falls is in the middle of nowhere, so you have to have an element of trust, but, so far, I have had the same BTC revenue using them as I did when I was running the servers at my own place.