The Big Cheese is just one name for the same trap marketed by various suppliers. It is not expensive (mine was just over £7), appears well made and is easy to handle, bait and clean. However, mine has been set in our loft for the whole month of October 2010, and mice have simply not gone into it. I have positioned it along walls and other vertical surfaces, and baited it with chocolate and peanut-butter, but it has not been entered, even when it was the only trap present. On other days, I have placed, within inches of it, both conventional break-back traps (one each of two types, wood and steel) and a Longworth live-trap (aluminium). All of these, with the same baits, have caught mice (a total of seven this month), but the Big Cheese has caught nothing. This is a pity, because the killer traps sometimes only injure (one case this month) and the Longworth trap, while high-quality and designed to last (it's used extensively by biologists), is very expensive (around £50). We live in the country in the east of England, and mice come into the house every autumn: they are of two kinds, the Wood Mouse and the Yellow-necked Mouse. I am at a loss to explain why they won't go into the Big Cheese, with its metal entrance-tunnels, when they will go into the Longworth (also a metal tunnel design). We don't get House Mice here; perhaps they might enter the Big Cheese more readily, but that's just my speculation.