Well I went for another spin today, seems to pull phenomanally between 4-6000rpm but the delivery is so smooth and progressive that it doesn't feel that different from the stock delivery, just more of it.
I also reset my average fuel consumption and today was returning low 30's whereas I normally got high 20's so there seem to be a gain there.
I got the select plus switch from Revo but haven't played around with it yet. I was thinking that I might want to stick it back to stock for the misses to drive but it's so well mannered that I think i'll leave it.
For matey that asked, there are Revo agents based all over that can do the work, check thier website for your nearest one, APD down here in Dorset were first class.