2004 sdi 600 w/3600 miles with a couple of updates done including the rings. Starts on 2 pulls everytime and runs like a champ. I blow a belt every 1000 miles due to the fact that I kept the outside cover on the cluth gaurd intact. I will have to open it up or drill out the rivets this summer. I also ride an 04 f-7 and have had every cat from the ZR900 to the 292 lynx since 1979. I love the speed of the cat but am leaning towards buying another 600sdi but in the Renagade and X package for my next sled. You can not beet the ride of the rev.
If an f-7 is getting beat by a 600 rev then something is wrong with the f-7 or the rev is supertuned. I have hit 110 on the digital on the icy road with the rev which is very good in my opionion for a 600. MPG have done as well as 18 and as poor as11 in wet deep snow conditions.