Just started using these and so far I really like them; so smooth! I don't typically like the harsh highs of roundwounds and usually play with flats, but I bought a fender p/j recently and slapped some D'addarios XLs I had on there. Overall, didn't like the feel or tone but they brought out a lot of growl and grind. These KS's (compressed rounds) feel fantastic and are much richer, less clanky sounding. Not quite the D'addario growl with the bridge pickup, but I get a sweet, classic P-bass grind that flats won't give. Think I'll try them on my future P purchase. And did I mention they feel wonderful.