Other than some catastrophic 2005 900RMK type failure, the reliability question will likely go unanswered for many years.
If you fancy a new RMK....other than trying it, what are you going to do realistically? Wait 3 years and piece together an opinion based on the forums? That's basically all you could do....it's not like they put out reliability studies with real numbers ala the auto industry.
Sleds (of any brand) simply aren't dialed enough in the reliability department to say that buying a Cat or Doo will necessarily be any more reliable. In our group, the Cats have been the least reliable by far, even tho via the forum people might think otherwise. The Doo SEEMS to be more reliable based on these forums, but no one has any numbers. Are they 5% less likely to have an issue? 20%? 50%? No one knows....and we won't know. If you ask what was the most reliable sled in 2001 you still won't get a clear answer.
What we DO know, is that none of them are approaching Lexus reliability levels anytime soon, so the chance of getting a dud from any of the 3 is definitely still there. And the chances of the end user messing up a finicky machine with more hp per liter than a NASCAR....via crashing it or tinkering with it....are higher yet again. So the chances of picking another brand purely for reliability, and still having issues....are still there.
I'm not saying that to make excuses for Pol....it's their bed to sleep in if things don't work out. Just saying that if you want to try this new sled, letting that hold you back when there really is no "sure bet," seems kinda pointless to me. I bought a new Pro in 2011 without even seeing one and had 0 reliability issues for 4 years. And there was definitely some enjoyment in having an all-new model. Maybe lucky, or maybe the failure rates are just nowhere near what some people think....again, there's really no way to know, as there are no numbers.