I'm really impressed with these strings. I put a set of TI flats on a stack knob Jazz and they sound GREAT. Couple days ago I put a set on a Dano DC Bass and it absolutely kills. LOve the tone, love the feel, don't mind the low tension one little bit.
I also just put a set of Jazz Rounds on a Jazz. The ultra-light gauge is strange at first (the E string is only .89) but got used to it quickly. They're also really nice strings, though maybe even more of an aquired taste than the JFs. They feel lovely, very slinky, and respond beautifully to a more finesse approach. Very balanced. Low tension but very comfortable to play, at least for me.
TIs have quickly become some of my favourite strings.