Hi Mates. I had a chance to test ride the MW Black-yellow 6.5m model a few days in Hatteras, NC. Very cool sail. One sail can cover pretty much any wind you throw at it with very progressive and controlled power delivery and speed.
I'm not a speed junkie but for racers it means you basically just need one sail that can cover wind from say 15 to close to 40 knots.
A few adjustments I had to make are that the sail pulls more forward almost immediately and I had to learn to grab the boom more when tacking. Big companies tell us they innovate sail designs but I really have doubts when I saw MW sails.

Found a video from Hatteras here