well. IMO noise gates are tone suckers, so you have to be careful while using them, but also IMO the little Boss, is a pretty good unit unless you wanna sprin g for a big rack mount unit.
the ns-2 works great when used to get rid of the noise of a distortion pedal and guitar. (set up infront of the amp, using the pedals send and return for the distortion pedal. won't get rid of the amps buzz because it's not through the effects loop)
i tried mine through my effects loop and it didn't work very well if at all. My g major's noise gate works perfectly through the effects loop, so if you want to get rid amp noise too i wouldn't recommend the ns-2 from my experiences with it.