Did you get both the performance and work keys? The work key is great for the grandkids, wife, or any company potentially under the influence that doesn't need "all that" :-laf. I absolutely love the Rotax power plants, they have a broad torque curve and the engines are dead reliable. Different engine family but the fact they are commonly used in aviation speaks volumes to the reliability.
Is that the 800 or 1000? I've got a "slightly" tweaked 800 that's been dynoed at 90 HP in a 600 lb quad. Still working on getting the clutching tweaked but the way it sits now it will eat everything I've put it up against for lunch whether its track, trail, or drag. It'll hurt ya quick if you don't respect it.