Well, honestly those TI Flats were previously on a couple other fretted basses before I shelved them for some time and was going to just sell them. I had issues with the feel of them, which is hard to explain, and it might have been they just needed to age some.
I installed them on the fretless Roscoe and it was a totally different experience! The strings are nice and smooth and seem to belong on fretless basses. They have a rich mellow tone with low tension. No zing or brassy sounding. Easy on the finger pads. Best of all, the TI's are only going to get better/mellower over time and, unless I break a string, they don't need to be replaced for a long, long time!!