I had a set of LaBella Deeptalkin' Bass flats on my Ric 4001 for over three years!  They would have lasted longer but I broke one!
 
The LaBella's are great stings.  Very bright, almost like roundwounds, but without the ringing treble.  These aren't like the vintage Labella flats.

I will probably try the TI Jazz Flats on my fretless when it comes time for a restring. I've heard lots of good things about them. I used to use Round wound stst strings exclusively, but since I started using Alembic guitars, the treble end is way too harsh for my ears. I always have a ton of high end and still back it off, thanks to Alembic's electronics. You can get the best of both string types by using a pressure wound string which Alembic actually puts on the new guitars now. They're easy on the frets and wood, great strong sounding strings, and only a little less flexible than fully round wounds. Top end is bright, mids are strong, and lows are full. Works for me!
Kris

FOREVER!!!