I was just wondering whether any of you have digital pre amps like the pod or the V-amp and use it in a guitar amp like a half stack.

There's a simple Crate 150Watt clean head that's cheap and light and i'm thinkin that combined with an amp simulator like a V-amp (yes i'm on a budget) and a simple cab might be orrite.

However i've read lots of discussion on pre amps and most ppl use them direct to power amps instead and not to guitar amps. Is it ok to use them with guitar amps (simple and clean)? do they sound any good? Or are they really only designed to plug directly in to Pa's or PC's?