The 40% is almost too big and slow...you almost need a 200 or bigger to fly IMAC with them. They are so slow they don't snap or spin well.
I have the 37% and it is too slow on the down lines sometimes. I think the 35% is perfect size, IMHO.
I must think like razback, a 37/38% Edge would be awesome................
Of course, Tom is coming out with the 35% Extra and that is going to be an awesome plane in it's size.