A big sound, too. On a 30-inch scale "Beatle" style bass, they seem large, compared to the traditional Hofner / Pyramid / La Bella sets. On a particular violin-style that accommodates the 35.5-inch ball-to-silk -- a very robust playability.
Anyway, I got TIs for several basses, not a cheap proposition, and then realized that although they all sounded and played stone great, these strings are so unique it transformed them all into TI basses. It's like suddenly having a fleet of Bentleys. Go for groceries? a Bentley. Go to the opera? a Bentley. Down to the dispensary? a Bentley. So I had to back off a bit ;-)
These are very flexible and low tension, very expressive, do not fear, they have plenty of body. My one bass that they most completely and irreversibly melded with is a short scale fretless 4 string. A wonderful little SX that cost only a little more than a set of TI flats. With short scale, the tension is even lower, it's like a chorus of shiny snakes is working magically with your fingers, each one wiggling and stretching to please. Amazing.
My 1963 P-Bass ended up with some more poppabble Nickel roundwounds, and my 6 string fretless still has its D'Addario Chrome flats until the day comes and I unpack that 6 set of TI flats that is waiting for it. I check in the Strings Box now and then to make sure it hasn't escaped.
No string fits every occasion. Or every bass. Now, if you have no TI flats, you MUST get at least one set, or two. If you mount them carefully, you can move them between instruments until you find the perfect marriages. And when you do, well, you might just go nuts like I did.