<< Rachshack.net uses it and unrestricted.net also uses it. However with rackshack you pretty much have to admin your own box and unrestricted.net has lots of downtime. >>
No longer the case...
That was primarily due to some carrier outages we had way back then, which has been remedied early last year with some network upgrades and improved redundancy:
http://www.hyperspin.com/publicreport/57207/7765