They were good back in the day. They were Rockford Fosgates competitor in the ol'skool days. At least they were around this neck of the woods. A buddy of mine had like a 1000w mono block pushing some Cerwin-Vega's it used to pound them the hell out of them Veggs.
i have one of the new ones and it pushed my volfenhag 10 just fine but I wouldnt recomend going out and buying one. i only bought it to get me through the winter until my new subs and amp got in.