Little - Light - Sounds Good
I purchased this last fall for an easy, Light, Small, pa system.. It works pretty good if your band's not super loud.. I play in a Metal Band and a Country Band.. This is more suited for the country band... (400 watts RMS at 4ohms) this sounds impressive, But all my speakers I have are 8 ohm, and yours probably are too.. It really only seems like around 85 watts per channel.. But handles any speaker with ease, even a big 400 watt speaker, when it runs out of power it doesn't actually crack or anything, it just drops off volume/power... (Digital Type Amp) so really handle every load..
The on-board mp3 player is ok, (but display is very limited) it works,, but not super clean,, and compresses when cranked.. But serves its purpose as an all in one unit for Practicing along with music.. or playing your break music.
The Bluetooth is a different story, It is pretty horrible. Works about 6 feet MAX, and if you walk between unit and device the signal will get interrupted.. sound quality is not as good as if you were using the SD/USB slot...
that being said.. It does the job / microphone sound is good --- If you want it punch, and Loud DJ some bass, you could add a powered speaker from the Monitor out..