I have survived a brief, but lucrative, foray into Buffalo Castle. My first experience was a positive one. I didn't enter very many rooms when I came upon the Bank Vault. I fought one wandering monster, a giant snake with no mate or treasure. I fought an orc on the way out. I opened one chest full of tear gas, and another with an emerald necklace worth 250 gp. In the vault I found a vitamin that doubled my CON, which started at a very respectable 15.
So, my final tally was 32 AP, a 250 gp emerald, a face full of gas (2 hits), and my CON doubled. Not bad, I don't think. I don't know how brutal BC has the potential to be, so I can't say just how lucky/good I was. I plan on hitting it again, though, since I only actually used about 14 entries. I know it has more to offer . . .