I have a bunch of wine openers and like the "spring steel" corkscrew type the best. You just put it over the top of the bottle and keep turning the handle until the cork pops out ... at least that's how they are supposed to work.
This one just didn't work well - it was hard to turn and because the turning "handle" was flimsy plastic I kept worrying about breaking it when I had to apply more pressure. Also, the plastic slots that are supposed to hold the cork as it comes out did not do the job, so it often didn't make it out of the bottle all the way and I had to pull it out as a last step. Finally, you should be able to unscrew the cork easily to get it off the screw - but again, the cork just turned with the screw staying right where it was.
I think the problem is that the screw is too thick and not flexible enough - not "spring steel"; and the handle is too flexible.
I am still looking for one like the several I already have that work like a charm.