With scramble set up on an ebc sure it has some performance related limitations, but you can live with them. What Al and Bam r33 were talking about is - to me - a high/low boost button, not scramble, if your going to hit a switch and hold a boost setting, it is a high/low booost button. Scramble is a momentary thing, it is not meant to be held for ever. I do agree though that [as I said before] it has limitations, and I also agree that it can affect motor longevity, especially if the motor will not take the scramble boost setting and it all goes boom or clunk.
I've got it, I've set it up to work, AND I don't know if it works [my evc gauge tells me it does], I can't feel any initial extra power, you won't see it on a dyno, and the normal boost settings and the normal turbo boost just takes over anyway. On the road you won't see or feel a difference.