I have ridden the 4 strokes, but bought a 2015 250 2 stroke. The bike hauls ass, and doesn't have any quirks about the chassis or anything that you might think. I believe it feels more like a Japanese bike than anything. I haven't had any reliability issues with it and the only parts I have put on it are new springs in the fork and shock, and a different handlebar. Clutch is strong, transmission is great, etc. The amount of trick/quality parts that come on it bring the higher price tag initially, but I believe will save you in the long run. I deal with the guys up here in Canada more frequently, but Ralph in the states has been a great asset as well for setups and things they have found for each model for improvements, longevity, service intervals, etc.
The only snag I would say is potential resale value. If you have someone who knows bikes, it might not be as hard to get a legit price for it, but if you are in an area without a dealer or many of them around it could be a bit harder. Anyone who knows bikes can look at them and see the quality, but Joe Weekendwarrior will probably ask you what happened to "K" on the name...
If you have any more questions I can help you with hit me up.