Well the little amp has difficulty keeping up with the more powerful guitar amps without driving it too hard (leading to distortion/muffled sound quality)

I didn't want to go with a bigger, more powerful amp, because I don't want to have to lug around big, heavy equipment

With the pre-amp gain control set to almost the minimum setting, and the "output" (volume level) set to the 9 o'clock position, I get more sound out of the main amp with it's settings at 5 than I did with just the main amp set to 8-9, and the sound is SO much cleaner

Works well as an inexpensive pre-amp for guitars.

In conjunction with my small amp, I can more than keep up with the loud guitar amps and drums

Well the little amp has difficulty keeping up with the more powerful guitar amps without driving it too hard (leading to distortion/muffled sound quality)

Works well as an inexpensive pre-amp for guitars.

Works as it should...

This is a really good, cost effective preamp that comes stock with an unreasonable amount of hum