bought a dozen from Horst gun a while back. i use them ocasionally in my .36, which has a Deluxe Large Siler in it. in all candor, i don't see what all the ruckus is about- no, they don't last longer than the Tom Fuller flints, but that wasn't my intention- i just wanted some thing that looked really cool, which i thing they do.
so, if all you want is sparks in the pan, and appearance is trumped by functionality and price, get the Fuller flints, but if you're willing to pay extra for a flint that doesn't last quite as long but is more aesthetically appealing, get the French Amber.
just one guy's opinion, and no doubt worth what you paid for it.