I picked up a Mach 2 9.4 and an M2 overdrive 7.8 today. The overdrive is very similar to the last 3 which is fine that's all I wanted. Its still very light and easy to rig and unrig.
The Mach 2 9.4 however, Wow I like what I'm seeing so far. I don't know the exact weight but it's bloody light. Very bloody light. Only 7 battens which is great for what I need but if I was a bigger stronger bloke doing a lot of slalom personally I would wan't an 8 or 9 batten skeleton. the twist is not as clean as previous sails but considering how light it is it's a trade off I'm more than willing to make.
Someone mentioned the clew pulleys. They are slightly smaller than the old ones and the 5 mm prestretched rope standard in the severne booms I have is too tight and doesn't work. I switch to some 4mm spectra which works well.
At first I thought the sails didn't come with a batten tensioner. They do, it's just in a different spot. I'm not telling where, I had to find it so you do too.
The 9.4 is so light I'm considering trying it for foiling with my old JP SLW 90. I have a Moses 101cm carbon foil which is quite big and powerful so I'm tempted to give the 9.4 a run in 5 or 6 knots and see if I can get going. Even if the 9.4 is too big I think the 8.6 and 7.8 would be deadly for foiling.
I'm hoping to give the 7.8 a run tomorrow either on the foil or Fox.