never heard of them.
the gflex is good imo.
i'm not picky about cab brand near as much as about speaker brand and model.
but that being said, i wouldn't want to own an all mdf cab like a behr even if it had my favorite -V30's- in it.
there are a ton of metal bands using them these days, necrophagist being one of them i can think up off the top of my head. i have yet to hear a bad review on these amps and they only cost 400 which isnt much more than an avatar or used genz benz.