Yes the T/C Agate Flints work very well. The problem with them is once they are dull you can only sharpen them with a Muzzy or Diamond Wheel and a Dremel tool. And then they are never 100% again. But I actually like hunting with a new agate. I am assured that I will have a nice long spark normally. The best Agate I ever shot was from Lyman. I lost count of how many shots I got off that thing. I was wondering after a while if it was ever going to wear out.

But normally I shoot a Thomas Fuller Black English Flint.