Uhhhh...
Yeah, this is one of those discussions. We can go back to the first sleds that were made of steel with various types of slatted tracks, steel and rubber etc. We can move forward to the days with boogie wheels and rubber tracks still with steel hoods and components. They were probably real strong... not so fun as they were more of the work horse machine.
The 70's brought some cool stuff, plastic hoods, slide rail suspensions and lighter faster fun machines. They are no match for todays breed of machine, they were fast, light and fun but the suspensions and deep snow capabilities were far from today.
The 80's had some cool rides but were still alot like the older rides. In the 90's we once again saw big jumps., especially in suspensions and deep snow tracks. The power grew a bit also but not crazy. The Phazer, Mountain Max, XLT, Summit and Powder Special were mountain sleds that had never existed prior.
2000 ish was drastic. The Edge chassis came out, Doo did the Rev chassis and XP, somewhere in there Cat did the M... series and Yammy did a flip to 4 stroke!!! Crazy!!!
Since 2010 the games have changed again. Doo's XP has T-Motion, Cat has the turbo 4 stroker and an even better M... series and Yammy has the Nytro.. actually a tad older than 2010 but still a cool ride. Polaris has the Pro.
If you want reliability by a Yamaha. If you want to turbo it, it is good for many miles even boosted. I have heard some pretty large numbers racked on boosted rides.
If you want light and nimble, the Pro is pretty much dominant in this class. Doo is very nimble too but the weight numbers are not where Polaris is at.
Out of the box the cat has some great HP numbers. I'm not fond of the actual sled, but that is just how it fits and feels. Everyone is different. I know lots of Peeps real happy with their cats.
We can rip apart every sled. Doo had engine and driveshaft issues with the XP when it came out. Polaris had a bad go with the 900. Yamaha needs to go on a diet and I don't follow cat so I really don't know what issues they have had. Bottom line... Doo and Polaris have probably had a few more problems than the rest but they have truly led the pack in innovation, change and design in the two stroke markets.
I am not saying that they are the only ones, but Doo changed the market in rider forward and used some old tech in new motors with electronic reverse. Polaris built the edge chassis which changed the way mountain sleds were built forever and now has the lightest mountain sled and they have also got a completely different outlook on suspensions once again looking at the Rush. These are the things that every one overlooks and they come with some headaches.
The good thing is is that there is such a thing as warrantee these days. It stinks to have a sled break. I personnally have towed every brand out of the hills including Yamaha and Cat. They all break, I have broken most brands too. I even broke a cat... I did own a cat years ago.
I bought a Pro this year. I love it!!! I have ridden it hard!! I purposely beat it on the trail bumps to test the drive line. I've taken some large jumps. I have over 700 km on it, maybe 1000 by now actually and I have not had a failure. It has performed flawlessly and impeccably. I also ride a turbo Nytro so I do some swapping. I love both sleds. If I had a Doo after riding a couple I know I would love it too. I haven't ridden this years Cat but I believe if I had a weekend of seat time, I would grow to like it too.
Bottom line is I can't worry about the potential failure. If it happens I will deal with it and collect my warrantee. I am sorry some people have had some bad experiences. I hope that Polaris has stood for the repairs. I have had very little problem with polaris standing good for the small amount of problems I have ever had with any of the Polaris sleds I have owned. I would expect nothing less!!!