Already talked to Curt at Ftx about this. Like the M10 myself and it was the original coupled suspension.
The M10 does two things real good; gets up on the snow and keeps you climbing up. So if you have the combo of track and power to lift the nose (with a little body english in there) you can have great funwith the M10. I never found it lacking on my triple 1000 with a 159".
Curt will tell you its the best at what it does, but it wont boondock and play like the newer ones. Me, I still kind of wonder... Have the suspension and the pro, might try it just to have a summer project. Not gonna the sell the M10 unless I see a good offer, and they are far between these days.
My 02