Me too, Genz 600 in my GAS days ( do they ever end?) and currently the Genzler 800. I find it easy to get ( what I consider to be) a good sound, lovin’ the ‘dirty’ circuit it sounds good with fretted and Fretless. Asked the question about running into 2 Ohms on their www and got a reply from Mr himself, don’t wind the Gain up too much and it will cope, was the answer. That’s a 4 (8 Ohm) Cab Rig if you want.. I’ve run mine with three C4’s, I’m a fan.
Something worth considering, maybe, I initially bought an Aguilar AG 700 from BD, binned it in favour of the Genzler, no issues with changing either.