There is a kind without the... screw, the spiral thing I mean. It's pointy and just slightly curved in S. I've been unable to find an image for it in five minutes.

I bet that, once you get used to it (after spoling a few hundreds of corks, that's it) it's faster than the "rabbit" model.

I say that because I used to be faster with the simple, T-shaped screw, and I've seen it used in restaurants by experienced waiters.