I have mixed feelings about this. We're in the process of moving from Linode to Rackspace but haven't flicked the switch just yet - was planning to this weekend.

Our Linode server (16 GB plan) has been performing terrible lately wrt I/O (compared to, say, a Macbook Pro running the same computations), and we decided we've had enough. I guess we'll have to compare the two after the upgrade and decide.