I left DreamHost mainly because of reliability. My DH host was going down a bit lately. That coupled with problems with outgoing email resulting in people getting their licenses up to 3 days late and I just had to do something. It also doesn't help when they make a big mistake, they act a bit coy about it (such as the recent billing fiasco). I thought about switching to Pair but I will be requiring Rails support so that ruled them out.

So, we'll see how it goes. The migration has had its share of glitches but most of that can be attributable to things not being wrong so much as different. I'll do a detailed comparison in a month or two.