I'll be attacked by all the Fender supporters for this, but I'm not a big fan of them. Actually, my favourites are Thomastic and I've made no secret of it. They are, in my opinion, head and shoulders above other strings. I won't use anything else now. Far, far better than the flats that originally came with my first Fender P in 62. The retro guys don't agree with me I'm sure and believe that flats should sound dull and thuddy. I don't believe that. If you listen to the recorded bass sounds from the 60s, which were almost always done with a microphone in front of the speaker in the amp, and played on a Fender with flats, by a studio musician, you'll hear that the bass is not dull and thuddy, but actually quite musical. And that was with the original Fender strings. The Thomastics are far superior to the originals and other brands today in my opinion. I think that the Rotosound flats aren't too bad.