Well, string ligatures are also known as the German ligature, and are used mostly by clarinet players. They have to be wound carefully, and it takes practice to wind them in order to get just the right amount of tension. I can't honestly say how the string ligature actually affects the sound. However, if you'd like some more information, go to this web site. sterkel.org/clarinet/wendl.htm

Get a Daniel Bonade and never change !!!They are inexpensive and great!!

look up Delangle he has been playing onVandoren string ligs in the past www.sax-delangle.com/en/gallery.html

As far as "wasting money" on ligatures like this, really it should be about what you want your sound to be like. A ligature can sometimes be a cheaper way to change how you want your sound to be. A fellow saxist in the area wanted to have a less bright sound, but instead of spending a bunch of money on a new mouthpiece, he swapped from his metal ligature to using a string ligature. And not the vandoren strings or anything like that, but using 1/8th inch leather twine that he bought at a Hobby Lobby. This darkened his sound nicely, and he didn't have to spend money on a Rovner ligature, or some brand new mouthpiece to get aquainted to. The downside was having to tie it every time he put a reed on. I myself play on a Winslow ligature, which really did have a night and day difference against several other ligatures i played on. It's all on preference of how the ligature interacts with the timbre. The more contact the ligature has, the more the sound will be affected. Softer materials like leather and cloth will darken the sound, while metal will brighten it up. My recommendation is to try different ones out, and decide for yourself "Is the newly created timbre worth the price of the ligature?" and "Is there a better way to achieve this?"