Take it from someone who just converted a Dunlop CryBaby to a compatible expression pedal. There is far more to Mission than aesthetics. There's a huge difference in mechanical tolerance, particular in the pivot tension mechanism. It took me quite a bit of effort to get the Dunlop stable enough at heel-down to avoid turning the wah back on when I lift my foot. The Mission stays exactly where you leave it. Of course, this is nothing that a hysteresis setting on the KPA wouldn't fix, but I'm not holding my breath for this feature.
Not from what i've heard/experienced. ashtweth had a whole bunch of Mission pedals that went bad on him. And my DVP1XL is a tank, you wouldn't believe how heavy and solid it is.