The idea behind it is somewhat similar to the Klein Mantra, namely that front end impacts will also activate the rear suspension.
That's all well and good in theory on the Mantra, but with no suspension bewteen the front wheel and the bars, and no suspension between the back wheel and the BB, it would have felt very, erm, rigid for an FS bike.
Basically you're left with suspension only when sat, and even then only at the saddle.
Sounds like the equally pointless Softride concept to me – or as I like to think of it, a very heavy and needlessly complicated, aesthetically abhorrent version of the humble suspension seatpost.
It's hard to see how anyone could make the Mantra look any uglier, but somehoe they managed with that carbon version. I'd love one cos I'm a bike geek, but bloody hell that's ugliness on a whole other scale.