I have the Kala solid body and the acoustic/electric. When I first got them I was using my GK MB115. The sound was good but I wanted a bit more articulation, if that's the correct word. After reading many reviews here about the Genz Benz Contour, I decided to buy the combo with the 15 inch speaker. So far I like it better than the GK MB115, just a bit more articulation, and lots of variety of tones and I like the Contour adjustment better than the on/off button on the GK. Nothing wrong with the GK, but to my ears the Genz Benz Contour is sounding like a better fit. I am not a gigging musician for now, new player with just 4 years of playing, but I would sure like to hear my set up in a setting where can crank it up. I'm interested in what the other Kala players are using for amps and what you're liking. Also, thanks to other members here that gave me advice regarding the Genz Benz Combo! Looks like I may sell the GK, don't need 2 combos.