I have three fancy openers including the Rabbit and variations of that - the variations did not hold up.

I stay far away from CO2 - scared the s*&% out of me the first time I used it.

I use one I got from Siduri on a trip there and it never fails even when I'm opening several cases a night and an event.

Once you get comfortable with the basic waiter's corkscrew, there's no need for anything else--It is a very important skill to learn. The others might be 2 seconds faster, but how many people are going to keep extra "Rabbits" in their glove compartment, travel toilet kit, and at their mother-in-law's house? Waiter's corkscrew--don't leave home without one!