My first flintlock was a Charleville. It was 'ok', but really didn't fit me well. I sold it, and in all honesty, I wouldn't buy another.
I've had a chance to examine Jackie Brown's guns at Friendship, and to be honest, I liked them, and the only reason I didn't buy one is because while I was there I found some other things that I liked a little better.
However, I did in fact like them, and I would in fact make a trade of a Charleville for one of his guns. You can in fact buy higher end, fancier, and custom made guns from other makers, if you so desire. From examining his guns first hand, I think he makes good examples of common, standard grade guns available to the common man of the Colonial era.
If you want something a bit fancier, and something that would make a heirloom and/or a beautiful example of the custom gunmakers art, then look at other makers - and prepare to spend more money.
If you want a shooter, and a decent and fairly correct common gun of the Colonial era, then by all means, make the trade.