The great thing about Slicehost was the size. They were big enough to be reliable but small enough to give a shit when you had a question on #slicehost on freenode.
PickledOnion's posts on the Slicehost articles page were top notch. I hope the quality continues.
It got to the point that I'd only recommend Slicehost, after a few bad experiences with media temple and the like.
DON'T FUCK IT UP, RACKSPACE.