Seymour Duncan Trem Pedal?

Would be interested on any opinions if someone gets a chance to play one:

http://www.seymourduncan.com/images/products/effects_pedals/sfx_07_shapeshifter.jpg

Been wanting a trem pedal with tap tempo - and I've been darn impressed with my Twin Tube.

Guess it's not released until September 3rd.

It seems very similar to the Cusack Tap-a-whirl in terms of features...

No volume control though...