I bought the stompware for a MG30, You can easily save the presets on it. You can save 3 presets and the 4th step is used as a tuner. It would be nice if You could change that and use it for 4 presets but that's not possible.
The stompware is very solid and made of good quality. I had sometimes problems when the stompware was not connected and plugged it in again, somehow my presets were gone, but I can't surely say if that's a general problem or it was the amp. It was no big deal, i saved them again and everything was fine.