Went to the local music store yesterday looking at amps, and lo and behold - thay have become a stocking GK dealer. So, I grab a Jazz bass copy and plug into a 400RB/210 combo and crank it up. "Dang, lotsa bass....must have an extension 1x15 cab hooked up....(look behind amp and realize I am on internal 2x10 speakers)....DAMN!" Then I tried the 700RB/210 and it was even better. Now I am craving a GK amp. So, are they worth it? How is reliability? I love the sound and plan to buy one very soon.