vBulletin's performance is a hell of a lot better compared to my last host (fasthosts.co.uk - which takes 60 seconds to give an error page! )
In addition, litespeed is pretty damn sweet.
Setup took maybe 10-25 minutes from payment.
Only problem I have with it is that SSH is a bit too locked down - wget/etc don't work, and sort of negate the need for me to use SSH in the first place.. (to get and unzip files without having to upload massive things)
I'm glad that MediaLayer is working out for you! I've personally only heard good things about them and I'm sure that you'll enjoy your stay with them. Please make sure to post back in a few months and let us know how things are going!