I think it's vaporware. His entire site is laden with hype and marketing drivel. Basicly, all it says is it's better because it takes no time to shift and it takes no time to shift because it's better. It reads like an infomertial that comes on TV at 3 am on this side of the pond.
This is the most technical description of what zeroshift is on the entire site....
ZeroShift is a new technology for shifting gear ratios in zero milliseconds. The ZeroShift mechanism replaces synchromesh or dog-clutches so most manual transmissions can be converted."
What is the mechanism? How does it work? Let's have technical details.