I was using the RMC flints on my TC. They got about the same life as the amber flints(depending on the flint of course). They were all I used in the TC because I could shoot and shoot and shoot at deer without worrying about it going click. Yes, they eat the snot out of a frizzen. And until TC told us all to take a long walk off a short pier, frizzens weren't a problem. I was getting about 5-8 years out of a frizzen before it wouldn't spark. Frankly, I'm happier now with the amber flints and a knapping hammer. I've shot about 100 rounds through my new gun this summer and I'm still on my second flint.
Remember, shoot straight and shoot often.
Good... Bad... I'm the guy with the gun.