It lays over and carves just like an M chassis and you can hold a sidehill forever on it just like an M sled. Unlike the previous Polaris chassis it is completely predictable in almost any situation. The little bit I rode on a Dragon I noticed it would sometimes just spit you right off the sled because it over reacted subtle changes in snow conditions or ski position, which the new RMK does not do.
I wasn't completely sold on this sled being "all that" until yesterday in Cantwell. I took it into a big bowl with steep sides and started sidehilling. I was able to pull moves that I never could have gotten away with on my M8. Uphill, downhill and sidehill 180 degree turns and the track never washed out from underneath me.
It also gets much better gas mileage and uses much less oil than im used to. The new ETIC from skidoo probably get slightly better gas mileage but honestly if fuel economy is such a big deal go buy a f'ing Prius and see how well it towes a sled

All in all. I would say if you are looking for a new mountain sled this season. Look no further.