FastTemplates or not?

Yo, I'm building a site, a sort of community for literature, and I'm using fastTemplates wich I find very timesaving, since I'm not the one who creates the design. But I have read, some messages here that says that it's kind of slow, with a lot of hits. What I wonder is, if it is a bad idea using fastTemplates for this kind of projects (I don't expect it to be a superhit, maybe a hundred hits or so per day) and in that case how I should do it? Thanks in advance for any answers! /Broder