Alesis TransActive 400 - High-Power wedge drum amplifier

While marketed as a drum amp, I bought this for my on-stage keyboard rig, fed from the output of a Roland KC-110 amp/mixer that's wonderful at home but realistically not loud enough for live. I can't say how flat the response of the Alesis is - doubtless it's optimised for drums. But since synths put out a mix of low-frequency bass transients and highs it seemed like a good idea. Have only done one small gig (100+ capacity) so far, but it did a great job. Why so few reviews for this excellent package that's remarkably good value?