For the PMP 500, I'm using in my band rehearsal studio(around 300 ft.) and using a pair of the speaker (by T.bone)
PMP 500 is a great option for the low budget or beginner band to setup their own place indeed. easy to use, clear user interface and all the I/O are quite easy to route or patch,
Pros
-LightWeight
-Reasonable price
-Easy to use
-build-in effects
Cons:
-fader and few knobs touching not very well.
All the function and patching are listing on the layout, no worries to miss or some mistake during your taking action form PMP500