For those that think the Flail is too powerful given the relative ease of obtaining it, I'm thinking about testing the following house rule:
"When you roll doubles, you automatically win the battle, but the Flail breaks in the process, and cannot be used. You may repair the Flail for 2 gold by visiting either the Armory or the Village Blacksmith."
I think this strikes the right balance better than other proposals I've seen (increasing the price or banning it entirely). The Flail remains quite powerful, but this at least slows it down and encourages you to use it only when you really need it. I also like that this encourages you to retain and use alternate weapons. One of the things I don't like about the Flail is that there is almost never a reason to use a different weapon when you have it. Let me know what you think!