[quote name='Misdee' timestamp='1454846371' post='2973408']
TIs are a good choice for roundwound players who are thinking about dabbling in the world of flats. They have a more articulate tone than most flats, and the lower tension feels more familiar than a lot of flatwound designs.
[/quote]
Yes, they don't necessarily have what I would call a typical 'flat' sound. If you've tried flats (but not TIs obviously) and didn't like them, you may like these... I'd say they're unique - as has been said, they are versatile in that you can use them for lots more than just traditional 'flat' genres such as jazz, blues or Stax/Motown etc.
Higher-tension, heavy gauge flats are a bit like suspension bridge cables, but that can be good. I like the feel and tension of La Bellas. And the sound, obviously.