My first one as a kid was a old Olympic, the first sled I ever drove, we had to lift the ass end and put gas in the carb to start it, One day my dad fix it, and just to try it he put regular gas in it then he forgot and said lets go at it kids, we did 300 yard and we blew it up of course ...
Second one was a safari 377, I liked it, it was a good sled but it blew up on me and I had to walk a mile back, I was young and it was a long walk at that time...
Third was a Polaris Indy light 340, I got my hands on a studded track and it was clutch up, from 0 to 90km it was impressive but that was it after that, that sled last me for ever it was a good sled.
Forth was a scandic 500, I hated that sled, it was a cancer, I blew a few motor in it and the coil was burnt so as soon as it was warm it would loose power.
My fifth was a Polaris assault 800, it was a good sled when I sledded by myself but if I went with anyone I hated it because all my friends had ether trail sled or full snow sled like summits or RMK's and the assaults is a in between so it wasn't good in ether. Then it also turned into a money pit, (PS: they all do) I blew a few shocks, I rebuilt the motor just to blow it up on the crank later that season and lots of little things along the way so I put in a crate engine in it and sold it to recover my lost.
Now I have a bravo trapper edition (137) I love that thing, my wife has a Polaris 500 fan that's a good sled as well, its bullet proff
My dad has a Yamaha Viking 1000 4 stroke and that's a workhorse but also a cancer...
My next sled if I ever buy a other one it will be a Polaris 600, I think that's the best motor on the market and I am not a Polaris fan in general.