I haven't actually purchased the amp head yet as I'm still considering the 250w or 500w version to fit both my budget and volume needs.
Get the 500w version, at that price it's a no-brainer.
fwiw I've used my BQ500 with a variety of Eden David-series cabinets and also my Flite Sound 12+15 stack. It certainly punches above its weight class regardless of which cab I've used, but it also definitely prefers a 4 ohm load.