Have you as I, a tendency to overuse the D-string on your nylon stringed acoustic guitar, and therefore feel a need to just buy a good, extra D-string (or like twelve)? Then I think you've found your product!
I've bought a few of these and they have worked great. All and all they are a great buy with good sound and a nice, clean ring to them. Not one have snapped on me and I will buy many the years to come. It's a great complement for someone on a tight budget, who doesn't wanna change all the strings every time.