Not yet, but I would like to know what you guys use for detecting knock. I know that the AFC is supposed to detect it, but my experience has been that it can see knock as well as ray charles can see you or I.
I use the J&S safeguard. It rocks! It retards timing when it hears knock, and then shows you how much it is retarding on a gauge. You can set its sensitivity, and also use it to retard timing for boost if you want.