We have a rackshack dedicated AMD 1.0ghz 512mb 40gig HD and running GMail, LinksSQL, VBulletin, many others but we did not use the generic setup with a plesk or ensim console. We hired a Linux admin (I know NT not Linux) to rebuild the machine from scratch using Redhad 7.2 and Apache. He compiled everything from scratch and did not use prepackaged code. So far it is running quite fast but it is still all in the development stages at this point so I don't have a long track record with them yet.
Dale Brown