After having TI Jazz Flats on my '75 Fender Precision for quite awhile I decided to try the Labella Jamerson set.The TI Jazz Flats have been far and away my favorite string.I also have the TI's on my Fender J. Well, they're both Flatwound but that's where the similarity ends.The TIs are skinny (.43 and up)the Labellas are fat (.52 and up).If the Golden Gate Bridge needed emergency cables they just need to get a set of Jamersons.These are very big strings.But being Flats they don't kill your fingers. The TIs have very low tension which makes them "Slinky" to some and "rubbery" to others.It's the only thing I don't like about Jazz Flats.The LaBellas have very high tension which I find to be a bonus compared to the TIs.It's easier on the pluck the LaBellas (nice on quick 16th note lines)but the TI's are easier to fret on the other hand (no pun intended).I play/practice a lot and even so I think the LaBellas will add a new layer of callouses to my fret hand. Tonally they are on separate planets. The Jazz Flats have a more subdued top and bottom with the top being very smooth and the bottom very "thuddy" much like an accoustic upright. The Jamersons are old style Fender Precision boom and sparkle. The bottom is much bigger than the TIs (boom) and the top is much more pronounced and forward (sparkle).The mids are a saw- off. One more thing...I had to set the action on my P higher to accomodate the Jamersons.But its not so high as to be a problem. If I were a full time Jazz player I think the Jazz flats would be the string (duhh.."Jazz" Flats???).But my thing is high energy Chicago blues and classic R&B.The perfect string, for me, would have: From the LaBellas - the lows and the tension From the TIs - the highs and the gauge I think I have two favorite strings now.I think I'll leave the LaBellas on the P and leave the TIs on the J.