Since D'Addario switched the product to their new NY Steel alloy however, it is a very different set of strings. I like D'Addario as a company, and was looking at racking up points for their swag using their replacement for the Player's Points system. But this NY Steel ... they say it brings more strength and tuning stability. These were not issues with the string that I ever encountered. And in this one guitarist's opinion, they bolixed up a really wonderful product. At the very least, they no longer sound good on a guitar where they used to really bring the mojo.
What more could you want? Color-coded ball ends? Got those, too. String changes take less than ten minutes.
The best out there.