You will generally have a little longer break-in with a 4-stroke than a 2-stroke, but that is due to the fact that 4-strokes (OS FL-70 excepted[sm=thumbdown.gif]) are ringed, rather than ABC construction. They also require periodic valve adjustment. In my experience (limited), if properly cared for, 4-strokes are no more finicky than 2-strokes. Definitely worth it.

-Scott