Not bad
I had a good look at them at the NEC Bike show. They do look pretty good, but really do think that Verns (which I have) are better made and better value, and of course Vern (who is now back in production) can accomodate any special design features that you might like to add.
The quick detach system of the MM's looked good, but personally I prefer the semi permanent Vern system, for security and strength, and with inner bags, they're actually just as practical if not more so.
I know you were asking for first hand views on the MM's but thought the above info may be useful? Apologies if it's not!
Will