I had the Duc Shop do the 600 mile service and install thier lightened flywheel two weeks ago. Got to ride it last weekend and loved the difference.
It revs quicker without any tendency to stall, etc.
It takes a little warming up before it idles and I did find myself staying in a lower gear while tooling along at slower speeds, but not a big deal.
I think in a couple thousand miles I have them do the cams.......!