Okay, I noticed the following.
The thing takes a little while to set up, but once set it says set.
Tranisent boost response, ie getting on the throttle in higher gears is much better, insted of slowly building, it just goes straight up to full boost.
First gear is not all that noticeable simply because my car revs out so fast in first anyway.
But spooling is definently quicker.
BASS OUT