I have tested an SAI switch with a 400ms and 500ms delay vs the standard/former 750ms. There is a noticeable difference at 400ms and it does seem more instant, even though the 750ms was always acceptable to me. IMHO anyone that was holding off on UPB because of the local load delay should be happy with the performance at 400ms. At least with the configurable options you can accomodate all kinds of tappers. Some people may have trouble with double taps at 400ms, etc.