These traps work great if catching them alive and releasing is what you want to do.  I have these, the Mouse Cubes, and the Victor multiple mouse trap.  This is the only one of these 3 I have ever been able to catch mice in, and I keep them all set up at all times in my garage.  You need to have this set up away from any breeze or it will trip.  It wors best parallel to a wall right up against the corner.  A tiny amount of peanut butter in the very back works great.  If you put the PB on a piece of paper it can mae the mess a little bit smaller, but once you catch a mouse it wil going to get peanut butter, pee and poop everywhere.  That is the bigest downside of this trap - to reuse it takes a bit of pretty gross cleaning sometimes.