I was migrated over yesterday and to be honest I feel I've made a bit of a mistake.
My pings are almost double on average and my speed tests are a bit like Ian's, very inconsistent from one test to the next, particularly during the working day when business traffic is prioritised. Much more consistent in the evening though.
There is absolutely no doubt that I would have been better staying put at Pulse8. You live and learn, eh!
Which speed tester are you using, and where does it think you are?
For some reason some speed testers regularly think I am in London when picking servers, and that skews the results quite a lot, especially pings.
If everything there looks fine, call them, they are usually very good at sorting issues.