The Carbon rear end is supposedly .5 lbs lighter, and if you are comparing to an 09 with a light-rail rear triangle it should be a little more then that. The Motolight is also made of a higher end alum then the ML-1 so there could be some weight savings there. I would guess that the ML 1 is less then a pound heavier and very similiar in terms of performance, but I have not ridden both to say for sure.
As far as price goes I usually figure weight is worth 1 dollar per gram. So I would pay 400 more for the 400 gram lighter moto-light.
The carbon seatstays only save 30g. But, they look to be much more reliable.
I upgraded from the aluminum to the carbon version on my 2005 ML for preventative maintenance. Sure enough once i got the old seatstay off I felt/saw what looked like the beginning of a crack at the typical spot.
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