I've owned a V2, V3 and MiniMP. The MiniMP does sound great (altho ultimately I prefer the sound of the Grace units), but imo the level knobs are not ideal for live recording - too small, too much range, and hard to adjust in a live taping situation, especially if you've set them a little high to start and need to bring them down during a show. I much prefer the 5 dB steps on the Grace and the better resolution on the trim knobs. The form factor is a little strange too.
Steve