stjames is right...for sheer ease of use, the levered-screwpull type openers are hard to beat (and they work amazingly well). The Metrokane rabbit is one of the best values for this type. They're just not quite as easy to keep in your pocket as the traditional sommelier's tool

.
There are some truly beautiful Lagiuole sommeliers tools available with exotic materials and exquisite craftsmanship; unfortunately the ones Ive seen have been
very pricey and not particularly easy to operate (very elegant, though). My particular favorite in this genre is the SOG
Vino. After years of buying cheap waiters tools that always seem to self-destruct after a few uses, I decided that Id spend a little more and get a quality product. The
Vino is solidly built and well-designed
comfortable shape, nifty little one-hand foil knife, and a grooved corkscrew that works much better than the other tools of this type that Ive tried. Its reasonably priced, and seems to be constructed to last. It also looks a little more elegant at the table than the good ol SAK

. The Kershaw Sommeliers Tool (the one with the wood inlays) looks very nice, but seems somewhat expensive for this kind of product. So
if youre a serious oenophile and have already spent thousands of dollars on your cellar and accessories, Id go with one of the fancy Laguioles
if youre just a regular guy who enjoys an occasional bottle, the
Vino might be just the ticket. YMMV, of course

.
Hmmm
between the
Vino and their new little neck knife with the integral bottle opener, SOG may well be on their way to becoming the drinking mans cutlery manufacturer of choice

.
Jim