I have on my california sound. It buzzes with dc power but not on battery power. What i did was added a wire from one of the ground point of the 1/4" jack to the negative of dc socket. Now it doesnt buzz with dc power but does on battery power.
The only good component in there i'd consider good are the pots, seem to be of acceptable  quality. I have an actone for backup, the soldering on the pcb is shoddier on it. Its cheap enough to not complain about, probably why not the best thing i'd recommend for live gigs but it works in a pinch.