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CJW said..
Sean is basically bang on. I've had an r8 overdrive 7.8 and now have mach1's. What I'd add is the OD feels a bit softer, particularly in the head. They definitely don't have near the top end of the mach1, not speed, top of the wind range wise. Personally I don't reckon you notice the weight difference when going.
I actually bought the OD for foiling but now use mach1's/hyperglide, as for course racing the mach1 is the faster sail, freefoiling different story as the sweet rotation on the OD and shorter boom size for size makes it a touch easier.
All depends on your priorities, if you want the fastest of the two with the bigger wind range, get the mach1/2. Doesn't rotate quite a well, touch heavier...the trade offs.
That's surprising.. I haven't weighed them but I got the impression that my M1 7m was lighter than my OD- although I think my OD was a few models old..