I think Ardisam (Eskimo) has really changed their product line this year. They seem to overall be a little lighter, but also less power and RPM. I bought a 2.5 HP Eskimo Shark recently when Cabela's was cleaning out old stock. I noticed thatthere is now two versions of the Shark available, 43cc (1.75 HP?) and 51.7cc (2.0 HP?).