I have this controller twelve o'clock for a while and I do not have much to complain about ...
the only thing I "regret" is that it is not self-powered but good considering the price, do not dream!

I bought it when my multi-effect pedalboard / midi fails is because I switch channels on my head amp / effects with the Rocktron .... works fine, do not ask him no more more ... qualify for the previous opinion, Rocktron offers a "real" MIDI foot controller, MIDI mate, but the price is not the same .... it will not compete with itself by offering twice the same thing at different prices!

I would not buy the Xchange controller for racks and change four times preset by piece, are not intended ca ... It must be considered as it is a simple switch A / B and more that can control a patch associated to the channel of the amp ... the one is not disappointed ...