I moved a lot of my stuff to the Rackspace Cloud since I'd been dealing with the terrible availability and email issues of Dreamhost for nearly 9 years. I figured Rackspace had their act together.
I was wrong. The same stuff was happening-- overloaded, slow machines, database servers going down, and a mediocre to poor control panel. Also, no Django, no Rails, no SSH, and no ability to brand the control panel for reselling hosting-- which they'd been promising for over a year on their support forum.
Altogether, I'm not impressed at all, and I'm very disappointed.