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First time you try 'em is amazing. Overall I'm more in the Labella/Pyramid camp as Thomastiks have a certain contemporary mid/upper-mid parpiness that doesn't work for some of the stuff I do, but they are rather delicious and definitely addictive.
It's not unknown to get 10 years out of a set. Depending on how acidic your fingers are.
How's the string to string balance (in terms of timbre rather than volume?) On the flatwound sets I've tried, there is a huge difference going across the fretboard, with the low strings being really warm and thumpy and the G being really zingy and metallic, almost like a roundwound.
I have a new set of TI's that I've had for months now......too expensive to use and enjoying my Status flats too much. Chromes had too much tension and Fender flats were a disappointment...