Has anybody had any expieriance with this amp? Thinking about upgrading from my trusted Carvin R600 Redline III which has served me well for years. I've been interested in Genz-Benz and had the opportunity to hear someone play a GBE 750 live with a SWR Goliath 4X10 cabinet and hear an Ampeg SVT with an 8X10 cabinet, the Ampeg sounded much richer. Now I know the Ampeg has twice the speakers in an 8X10 cabinet so it has the advantage. Any opinions?