my .02 on the subject..
Yep....for those riding in 3-7000 ft range the stock '12+ clutching works good for most guys. I don't think anyone has ever said otherwise. RPM is fairly consistent since they got away from the reverse angle helix and the durability and tolerance issues they have had in past years. Keep in mind the factory clutching has a part in achieving the decibel and EPA regulation that these sleds have to meet. Perhaps dropping rpm under certain test conditions to meet those standards, although the etec being so clean it has opened up more options for stock clutching.....like getting away from the reverse angle helix that allowed the ptec to meet EPA standards.
There are small gains (or call them changes) to the power delivery or feel....making the power more "useable" for lack of a better term, for many riders. There are some gains to be had at lower shift ratios, mainly from running a progressive helix that loads things harder at low ratios vs the stock 40....stock is snappy but still a bit buzzy at low speeds. I prefer that grunty, linear feel for tree riding.
I get to talk with a lot of xp and xm riders. You might be surprised how many don't like the stock clutching or how many eat belts on a regular basis...it surprises me at times because I don't think stock is terrible and I try to make it clear exactly how our setup is different from stock. I want people to have realistic expectations and many times encourage some guys to stay stock if they are happy with it. Most that do change are more than happy and some see more gains than others....especially the extreme low and high altitude guys that ride outside where the stock calibration works well. At low altitude, If you load up the stock pins to get RPM correct, then you have a lazy backshift and slow rpm recovery (if at all) due to the stock, soft secondary spring. So then guys start messing with secondary springs...then they see too much heat and slow upshift using a stiff spring with the shallow 40...so then they start chasing their tail and trying different helix's. There are many riders who benefit from going with different clutching. Some would rather not spend the $$ on a whole bunch of parts to make it work the way they want, while some guys enjoy clutching and searching for that perfect setup...
Just showing 79-8000 on the tach isn't everything to everyone. Power delivery, feel, engine braking and even small gains in climbing track speed while lessening belt problems are huge to some people....and thats where we do our best to make a customer happy, as I'm sure the other guys that offer their version of how a mountain sled should be clutched.
The vast majority of our customers come from someone who rode with another customer with our setup and got to ride it to compare. If there were no positive traits to be had, Im sure we wouldn't be getting phone calls. The funny thing is, we have been getting as many calls from XM guys wanting a change from the stock clutching as we got in previous years when the clutching was clearly lacking. There is no magical setup that works perfect for every sled and every rider....Ski Doo knew that when they settled on calibration, and we know that with the setups we offer. Its nice to have choices.
If your customers are happy that's all that matters I guess. Merry Christmas