I owe this to everyone: My luthier is the one who got me to try Obligato. Pirastro had been asking him to get someone to try them, and I was the happy guinea pig. Today, while I was at his shop, he made a sarcastic remark, which I questioned. He reports many instances of the Obligatos breaking. Now, "many" is a relative term; but since I have never known a steel string to break, even a few cases is too many. I used my set on the orchestra bass for about 10 months. Then I put them on my jazz bass as an experiment, where they got a good 40 hours of hard pizz work. No problems whatsoever. The only thing that happened was that under heavy pizz in a big room, the outside winding seemed to be loosened from the core and it spun a little. I figured the strings were just beat, and I replaced them. Bottom line: 1. They sound great. 2. There are reports of premature breakage that I have not heard regarding other strings. I will continue to buy them, but I have to report what I heard.