Wow. I'm a month into my experiment with Flats on my jazz.
I'm using Chromes, .40 - .100. These sit so FAT in the mix, with great fundamental and definition. Last night I played an outdoor gig, and the bass tone was huge! After 30 years with rounds, I'm definitely impressed. These will stay on for quite some time!
Just wait until they really break in!
I decided to give chromes another chance after hearing this:
http://www.youtube.com/watch?v=Cm_4M-nBpCE
For me, it took about 6 months to get mine to this point. LOL...... I'm extremely "protective" of my P with the chromes...... I'm afraid of having to go back to a new set and playing them in for 6 months. Sorta like an old broken in baseball glove..... nothing feels better!