I have mounted these on pennies and played my first game of Brother vs Brother yesterday. It was a fun beer and pretzels type game that should work well on a large table with mixed forces. My first game was a learning game on a small board, which really did away with any benefit for having artillery.
Above is a unit of Berdan's sharp shooters. In brother vs Brother there is no provision for snipers or long shots, so we just played these as having breech-loaders, which means they get to fire every turn instead of every other turn for the normal rifled muskets.