My honest opinion about my new Power Kabinet? It does the trick.
Would I take it to gigs? Probably not, but in terms of speaker in the room it does exactly what it says on a tin.
There is a bit of a hum coming out of it and its more like a digital hum whether you are on a heavy or clean rig, same thing, but it doesn't bother me. There is no hum when you record into your DAW and thats what matters the most I guess.
Overall I'd say it is a decent speaker, slightly overpriced, but I don't regret having one. Worth saying though that I only intend to use it within my home studio, whether I am practicing or composing/recording something.
Frankly speaking I can't see it's being used for any thing else really..