What is the setup like for the MyMix stations. Does each station have to go through the list of possible inputs and pare it down to 16? For a fixed installation I can see that this is a mostly one time setup per station. However, I think it gives the user the ability to screw up their mix. It seems that a lot of amateur musicians think they need everything in their mix and want a mix that is like the house mix. Those that know what they are doing will ask for only what they need in their mix.
While the MyMix does seem intriguing to me, I'm still in the Roland M-48 camp. Plus, I still don't like the big LCD screens on onstage equipment in a setting where going to black is a requirement at times. The proliferation of onstage LEDs and lights drives me crazy and detracts from the mood of the performance. I know people are becoming more accustomed to it, but I still think that LCDs will even more distracting that little LED lights.
The Roland has a better set of features in my book. And the system operator can set up each station by copying another station setup. Additionally, they can pool inputs on one station group. The only thing the MyMix has that the M-48 doesn't is the recording to SD Card, but they do have a record out.
Regardless, competition is GOOD!