No I will never go back to a 2 stroke, unless I absolutely had to just to ride. After all 2 stroke or 4 stroke, snowmobiling is snowmobiling, and I love it either way. Last year I enjoyed not having to take the hood off for the whole year. All I did was gas and go. Also for my 150hp Apex I still have the original belt and spark plugs. This can probaly not be said for most Mach Z owners. I am a kind of guy who is not much of a mechanic, I would rather be riding than changing or fixing stuff any day and the four stroke allows me do that. I have about 3000 miles on my sled now and my warranty will end in December 2010 and I plan to keep the sled all the way till then and hopefully have over 10,000 miles by that time. When the warranty ends I will see how much my sled is worth at the time, and I will then either sell it or keep it. Although either way I be in the market for a used low mile 2009 Nitro at the time.