I bought a set of the GHS 45-105 precision flats last December and have had them on a j-bass since then, I find that they nail the vintage tone and give me a solid fundamental with a defined thump. Perfect for what I play and do. I also find that the tension is perfect for me, not Jamerson-esqe but a bit more tense than your normal string. I just ordered a set of the 55-105 for my p-bass and I'm looking forward to it! When I was doing research about the precision flats, I saw multiple people saying that these strings are the closest set to the stock flatwound strings that came on Fender basses in the 1960's. I guess this has been deduced from the fact that GHS and the V.C. Squier string production are/were both based in Battle Creek, MI; possibly in the same factory? I guess I'm just grasping at straws here, but the topic is just food for thought. I had seen the topic brought up in multiple threads about GHS Flats and if anything, it's some nice discussion on a slow work day . Sorry if the topic has been covered before!