They are great strings if you want brighter flats with a round wound-ish tone and a flatwound feel. But they are VERY different from TI flats and shouldn't be considered as an alternative to TI flats IMO.
But then again, I could say the same about ANY other flats. TI flats are unique. They are also quite expensive, but if you want the tone/feel of TI flats, there really are no other options that will get you even remotely close.
At over $100 per 5-string set, I think pretty much any other flat wound string should be at least
considered as an alternative to TIJFs. I’ve tried TIJFs on a few 4-string basses (and still have them on one) and have never found them as irresistible as some players. Their feel is not drastically different than LaBella LTFs with the exception of the TIs having a much more noodle-y “A” string of any type of flats. Actual measured overall tension of the TIs isn’t super low at 140.2 lbs, but they are lower tension and more flexible than
most flats, which isn’t a positive for all players or all basses.
Their tone wasn’t as inspiring to me the EBCFs which have round wound-like tone. They’re not exactly like rounds, but similar to a brief period in the life of a round wound string, however, the EBCF tone lasts MUCH longer. That’s with the tone knob wide open, but they have old school flat tone with the tone knob fully CCW, and useable tones in between.
TI tone is unique, but it’s also somewhat one-dimensional, and not a one-tone-fits-all dimension for everyone.
I can only speak for myself, but I find better performance for lower price than TIs with a few different flats; EBCF and LaBella Olinto for a couple examples.