I've been playing my uke with fremont black lines exclusively for quite a while, and I just picked up the soprano that I used to play the most, and I really hate these Aquilla nylgut strings that I used to think sounded just fine. They're so tinny and plasticy. Bright I think is the term, idk. I've only tried 3 types of strings (the other being D'Addario fluorocarbon), but I feel like the black lines are superior (at least to my taste) in every way. I can't think of anything I like better about the nylon or fluorocarbon strings. I wonder how much the ukes themselves play into this though. Maybe the nylguts sounds that way to me because it's on a soprano? Maybe the fluorocarbon feels lacking because it's on a Nova U (plastic)?