Yeah, we've had more problems, than I'd like. (I'd say we get great load times 80% of the time. the rest of the time it can be a little slow.) We're currently with Dreamhost, eying Media Temple.
Media Temple Grid Server had uncomfortably high latency for me. Really terrible latency, in fact.
Go VPS and never look back: Slicehost.com (best service/documentation/been on the same virtualization architecture longer than linode) or linode.com (also very highly recommended and slightly cheaper than slicehost)
Maybe its because the site is so simple, but I would find it hard to believe ANY successful startup could be ran on shared hosting, never mind Dreamhost.
But a nice performance boost from shared hosting would be a 256 VPS from Slicehost ($20/mo), then you can scale up to more ram/CPU as you need it... :)
We use Mediatemple and they are great. If you want a contact, email me at shafqat at newscred.com and I can put you in touch with someone to get a discount.
(I have no affiliation with them, nor do I make any money - they've simply been good to us)
