From what I can gather, they use a basic orifice damping system, so don't expect the performance to be the same as the Shermans. They'll be a great competitor to the Marzocchi DJ line of forks, but the Manitou's will hopefully have the upper hand with weight and stiffness. I'm interested to see what the reviews say of them, and the price certainly looks right too.
Oh wait... fuck... just read they have cromo stanchions. So should be bloody strong, but forget any chance of them weighing a reasonable amount.