This is a good plugin. No, it's a great plugin - much easier to use than the other big name caching plugin out there.
However, although once upon a time caching was only for advanced users, these days everyone on shared hosting needs caching - and here's the problem: the majority of shared hosting users are not going to be savvy enough to decipher all the settings and know what's best for them, or indeed what many of the settings actually do.
So, please consider caching-newbies and either (a) provide a number of possible configurations which people can try out or, (b) provide more extensive guidance in contextual help.
As it is, I only award the plugin 4 stars.
Anyway, keep up the good work. Thanks!