While I have not experienced the Ultimate, I do own a Hog Bipe. The Hog is one of the easiest planes I have ever flown. Yet, it will get wild when I feel froggy. I think it seems underestimated here, just a touch, but the powerplant is the key. The two bipes in question are only similar in that they are bipes. They have very distinct design differences that give each it's own flight personality.