I guess the answer may depend on what kind of changes you want to accomplish and what kind of environment you drive in. One problem with Acme is that I didn't see any models offered in stainless steel. If you have a lot opportunities for dings, it might not be a good idea.
I needed more torque with the ballast I'm running in a V-drive, and everyone raves about Acmes. So I put on a new Acme two weeks ago. It is very smooth, and it pulls people up instantaneously. Without ballast however, it will go to the rev limiter. I never drive WOT anyway, so that is not a problem.
I'll just have to wait and see if going from SS to nibral was a good idea in the long run.
By the way, if you decide on an Acme, I'd check with the factory to see what model is best for your needs. Then I'd order it from from http://www.propellersonline.com/
. Fast service, the best price, and free shipping.
(Message edited by fogey on August 01, 2003)