Here are few reviews
DedicaitedNOW in NJ these guy are great they replaced a failing drive in less then 10 minutes for me on a Friday night at 11PM. The one time we need a server reboot with them it was taken care of in under 10 minutes. I am actually waiting for sales to open again to order a another.
I also thing think "The Planet" is pretty good but I have never needed support from them to really judge how they handle handle hardware support. We use total control server so even for a reboot we really have not needed them.
we do actually receive a call from a NOC tech every once in a while when one of our servers is hit with a flood attach and triggers one of the monitors we have setup.
Servint we have never needed support to this point from them but I can say they setup our server in less then 4 hours and we placed the order at 10PM EST and it was online by 2AM EST.