My 6th or 7th plane was the GP Ultimate 40. At that point I had been flying for 5 years, probalby an average of once per week throughout the year. I had progressed through an Eagle trainer, Tiger 2, Extra Special, Laser 3D, and several 3D profiles. The Utlimate was no problem at all. It is well behaved with no bad habits. You do need to stay on top of it, e.g. you can't take your eyes off it for a few seconds and then look back and expect it to be flying straight and level. You also need to keep the airspeed up during approach by either keeping the nose down or running some power. The most notable difference between a monoplane and biplane for me was the visual image. I found the second wing and the stuts between wings to present a confusing image. I had a several ocassions of panic when I lost orientation close to the ground, and I planted it nose first once during a low knife-edge pass gone horribly wrong. I had to dig the engine (Saito 72) out of the mud. The Ultimate airframe is strong and survived the crash to fly again.

These are just my personal observations. They are not indisputable facts. Relax guys.