I play exclusively on flats with my StingRay since 8 years now and 5 with one set of TI. Amazing strings. Great tone, great life but one big (for me) disadvantage. They are too floppy and too light gauge. Now I play on Slinky Flats 45-105 and I'm really happy with them because they sound like a roundwounds and have nice tension. But still different animal than TI flats when it comes to sound and feel.