US side
We have some servers at ev1 - cant say I have had any problems to date with either the service or support they provide.

UK side
I have some servers based in a facility in Reading, again no problems with that, and as the connectivity is about to be upped, im more than happy with it.
Simliar to rob, I use some servers in Redbus interhouse too (HEX), and plan to put some more gear up there hopefully by the end of the year / early jan.