I worked for a dealership that sold Yamaha and Kawasaki, for 28.5 years
In those almost 3 decades I never once had to go into a Yamaha front diff or even the diff drive, including Rhino, Wolverine, Viking, Grizzly, YXZ and then more recently the X2 and Rmax. Kawasaki's were mostly bulletproof until the Prairie 650, had to go into about a dozen of those, some had to be replaced totally. Generally, owner would engage it while the rear wheels were spinning at mach 2.6 and bang, stuff breaks. Sometimes the diff spider gears were trashed or seized to the cross pin.
I got burned out with the 4 brands that they had at that dealer and moved on. Now at Polaris. In 3 months, I've already had to replace 3 diff's 2 drive shafts, multiple axles, etc. BUT...Polaris also has a good bit more power than Kawi and Yamaha so that may be part of it. The Polaris AWD system is a joke, I mean it works but it's more complex than it really needs to be. Should've taken Yamaha's approach. Mechanically LOCKED when you choose one of the two diff modes (4x4 or 4x4/diff lock). Then there is no questioning whether it's working or not.
We're taking on can-am this Spring. The visco lock is going to be new to me. I've been around can-am a little bit, but not nearly enough. Neither has the service manager so we're all in for a lot of learning. I hope it's more reliable than Polaris, and hope it works better overall. Theres things I like about Polaris, and there's things that make me go what in the world were you thinking when you designed this???
I still prefer Yamaha for a SxS, sure liking the Rmax. I like it better than I do the General but the General 4 seater destroys the Rmax 4 seater in terms of backseat comfort. The front seat is pretty nice on the Yamaha, but so is the General. I might look at buying one or the other at some point, well after I win the lottery of course.