Hi xstrange,

One of the selling features on their website is the fact that you use it for any gear over 20mph (or 15, i forget). The idea is that it keeps you in your power band, and minimizes the big jumps in rpm between gears.
The gear vendors website has youtube video where you can hear the car shifting gears through overdrive in each gear, but you can't see the operation of it.

In principal it reminds me of the 4+3 trans put into late 80's corvette's. Those were 1st, shift to 2nd, push button to 2nd overdrive, shift to third, push button to 3rd overdrive, shift to 4th, push button to 4th overdrive. It didn't require you to unclick the button to go from an overdrive gear to the next higher or lower gear, if I remember right.

It makes a wide ratio trans into a close ratio trans...

darrell