I have one. It shoots really good and straight. I built it from a kit- if you are going this route, plan on spending months working on it, and it won't svae you any money over a finished rifle.

The only problem with mine is that its good for about 2 shots, then the ignition becomes very iffy if I don't keep the lock and flash hole very clean. I also opened up the flashhole a little on my rifle which seems to have helped somewhat. Not sure if this is typical with other flintlocks, as I don't personally know anyone, nor have I seen anyone else shooting a flintlock.