Ausie-guy,
I definitely think you should buy one and test it for us
and then based on your report we will act accordingly. Seriously though, if I can find some positive feeedback from actual users I would be tempted. I read in one post that a guy claimed 15 fps increase, I doubt that but would be curious about actual performance. As to cam lean, doesn't there need to be some in some cases based on cam design? The guys at STS swear by them and actually link to them on thier website and I have been pleased with the STS on both the bows I have used it on.