I've been mixing them for a long time. I've done swr heads with peavey cabs, swr with ampeg, Harke amp with peavey cabs. That's aside from the matching setups. A lot of times it works out great. I really like my swr 750 head through my ampeg classic 410he(also had an 810e. Both combinations seem to complement each other better than my swr head and swr 610 do. I pretty much use ampeg cabs exclusively these days as they just last longer. All the other cabs I've owned only lasted a couple years. But I've owned ampeg classic cabs for up to a decade with no problems
I could see those two pieces of gear being perfect compliments to each other.