Got my Kemper power rack a few months ago after mulling over several different options and can say I have no regrets. Mostly play Thrash / Death Metal, but also have played in Punk and rock n' roll bands. I've been doing a lot more studio work and wanted something that I could transport easily from the studio to the stage, and the Kemper fit the bill perfectly. For practice and live gigs I've been using a lower end Ampeg 4x12 with crappy speakers for my stage volume and obviously going direct to board for FOH sound. Also, use the cab for practice and for the most part it works great. I found that with the cheap speakers and cab sim on I get a good overall sound. Only issue is that the cab is so unidirectional that unless you're right in front of it, it sounds distant and I have to really crank it. Previously, I tried my other cab, a Marshall 1960a 4x12 and with cab sim off or on I wasn't able to dial in my sound.
So, I decided to get a Headrush 12" FRFR as monitor for the drummer and me. Thought was since this is more for practice I didn't need Also, figured it would fill the room a little more. My thought was powered out into my 4x12 and monitor out to the powered FRFR. I just got the Headrush yesterday and pretty happy with it so far. I tested it out at home and got it up to 4 before things were shaking and falling off my shelves. Next week I'll be able to try it out at practice and I'm pretty sure it'll work as planned.
Anyways, just wanted to say "Hi" and look forward to sharing info and stuff.