I did a festival up in Quebec a couple of years back and the backline was typical - Ampeg SVT through a matching 8x10. Once I plugged in, I realized the head was having issues and the stage manager yanked the whole rig, replacing it with a GK 800RB through a GK 1x15 and 4x10. The tone was bloody fantastic - the absolute closest I've heard a solid state amp come to juicy tube goodness ...... it was exactly what I wanted. I've been a huge fan ever since but admittedly, I don't own any GK gear.