get the 9101s. they are more expensive, but they are well worth the extra money. my rudder is a 9001, my ailerons are 9101s. there is really a diference in reaction time. even if you just move the sticks on the ground, you can see how much faster they are. my ailerons used to me mushy, and responded kinda slow. i replaced the ailerons from 1 inch stock to 1.5 inch stock and tapered it. i put 9101s and CRAP! WHAT A DIFFERENCE! i can do about 2 rolls per second, and the thing responds instantly. The ailerons aren't even mushy at low speeds. they aren't perfectly crisp, but i can roll the thing a 1 roll per second at just a couple clicks above stall speed