I'll have to side with Chris on this one. Its always a pleasure when a new student shows up with an Avistar. Slightly more advanced with a semi-symetrical wing, very durable and not to complicated on the build. My personal feelings as to engine is the .46LA as it offers good power to weight ratio. Stall speed is around 17 MPH, with a wing loading of 19 oz. sq. ft.(not too bad) What it does compared to a flat bottom trainer is, it offers a plane that could stay in your fleet well after the learning phase. A good, no hassle, care free flyer that I still enjoy to this day. Good luck with your decision. Joe