I'm on a shared server. No problems for the past 2-3 years I've been on it.

The only time there was a problem was when the Taiwan earthquake crippled Internet lines.

I think if your blog is as popular as KennySia, XiaXue, Minishorts and JeffOoi..you either purchase more bandwidth or if you have monetary support, get a dedicated server.

Readers can become very attached with your blog.