It is unlikely that even the most skilled wine professional can remove a cork cleanly from an aged bottle of wine with a traditional corkscrew.  When confronted with the task of opening an aged bottle with the cork intact, the Ah-so is the go-to that has the highest probability of success.  But success is not guaranteed.

The Durand raises the success rate of removing old corks cleanly to nearly 100%.  The Durand is a combination of an ah-so and the "worm" of corkscrew.  The worm provides a stable backbone through the length of the cork, keeping it from breaking and/or sliding deeper into the neck of the bottle.  This is that extra something that guarantees the work of the Ah-so can be done with less concern for the things that could go wrong during the extraction of an old cork. 

I have consulted with a number of sommeliers that have opened many bottles of long-cellared wine.  They were like, "Oh yeah, a Durand.  They're fantastic!"  Apparently, there were plenty in the know far before I made this discovery.

There is not much more to be said about this ingenious wine tool other than "It Works!"

***Beware*** There are several websites which offer this product at below manufacturer's cost.  I almost bought from one of these sites.  I noticed that the URL was different than the branding on the webpage.  This raised a red flag.  I researched and determined that this and other site offering deals that are too good to be true are often malicious spoofs.  I opted to buy from the legitimate manufacturer.  If you decide to try out one of the questionable sites, please let me know your results.