I have the TNT of the 1200's which is the short version of the XR Chassis. This quite possibly is the last machine that I'll ever own, it's that good. Incredible torque throughout the powerband and under 500 lbs. The engine is quiet, above 60 all you hear is the wind and it corners like a charm, very stable.
The engine braking is unique to all 4 Strokes. It takes a day or two to get used to and then you begin to use it in the corners, you seldom touch the brake. As stated above, around 15 miles per gallon. The Oil & Filter Change are easy and take about 10 minutes. It burns Regular Gas and uses Synthetic Oil in the crank.
On the Minus Side, the cost of these machines is prohibitive for many, especially in a low-snow year. There's not much storage available which can be addressed with Dash & Tunnel Bags. But in reality I don't have a need to carry much anymore no plugs, no oil, just a spare belt & tow strap. There's no recoil on these engines and I doubt you could spin it with a rope anyway.
There's a lot to like with Doo's 1200. These engines came out in 2009 and there have been very few updates, they got it right the first time.