I just boughtr a new GK700rb and I'm very happy with the settings. so much I don't want any other colour. I would however like to add a few effects and I'm considering using this effects unit for a headphones practise amp. I'm looking for something that has very decent effects but not all that amp simulator stuff. (why spend the extra dough to sound like an amp I don't have when I already have the amp I like?) I was looking at the boss gt-6b, and a smaller digitech effects unit. who knows maybe even a rack may do. As long as the effects are good, little to no colour, headphone jack, and I want to try an keep ity simple.