I used this with an Axe FX II XL and a stereo Engl cab.
This unit is extremely loud in bridged mono mode with an 8 ohm load. Lots of headroom.
As well as bang for buck it also delivers strong sound quality, even at high levels. A little tweak of the graphic on the Axe and I had my usual sound, but louder (I had been using a 150 watt solid state guitar head).
The Reactance and Definition controls worked well to boost the bottom and the top end respectively. I'm not saying they are bass and treble controls but they seemed to work that way.
Unfortunately I have had to send my Rocktron back to DV247 the online PDF at Rocktron clearly stated the unit weighs 3.4kg but it actually weighs 8.5kg.
I say unfortunately because I would have definitely kept this unit if it wasn't for the fact that I have to fly out to gigs a lot. This weight issue would send my overall weight to 32.2kg and airlines don't like that.
If you aren't concerned about the weight then I would say that this is a very good value alternative to Matrix amps.