Yeah man!
Ordered a dozen after reading about them here. My lock is an old style T/C, a known flint-eater from what I understand. This was true with four other types/brands of gunflints I tried in the past few months, but it apparently has no appetite for Missouri chert. Tried about half of the baker's dozen he sent me to see how they sparked, and all were hotter than anything else I've tried. Picked the worst looking of the bunch & clamped it in for shooting... 36 shots later, I swear it hasn't changed in performance or appearance one bit. Not grooving the frizzen either.
Had my mind made up to send the lock to T/C for replacement after Ky muzzleloading seasons, but now I'm not so sure.