Just read all the above, and one thing I would add for a flint, is a Fast lock! I know some locks are better than others, but even the best can stand a bit of tuning.
Re. flint in bad weather, I used one for about 10 years straight, just to see "how it was" and when we got to know each other, we had no problems at all with lousey weather....in fact, in Real bad weather the old percussion has let me down Much more, and is harder to keep clean.
Not wanting to change the subject here, just meaning if we Stay with a flint and don't flip-flop with weather conditions, they can work amazingly well!
Richard.