This type of trap is highly effective IF you do NOT follow the directions about how to place it. If you bury it (which the directions will tell you to do) it will simply NOT work. If your "out o sight" trap is out of sight it is TOO DEEP and all you will get is holes in your yard and perhaps an annoyed mole.
When the very expensive exterminator (who we now refer to as "Mark the Mole Man") came to our house, I showed him our "out of sight" mole trap. He tried to be respectful but finally just said, "Ma'am, that's too deep. Ain't gonna kill nothin'." As it turns out, this is exactly the same type of trap he uses. He just knows how to use it correctly.
He pulled it up and knocked the dirt off and walked around the yard for a while telling me stuff about moles. He clearly took great pride in his mole murdering skills (please don't give PETA my address.) Finally he stopped, stood silently for a moment, then he stepped his boot gently on a run until the soil was level with the surrounding soil. Next he took his special tool for making the slits that the previous reviewer described making with a shovel, and he made his two slits in the run for the blades to fit into.
Then, artist that he was, Mark the Mole Man pressed the trap blades slowly into the slits he had made until the flat trigger was sitting gently on the soil. Released the safety and - Done. He placed three more in the back yard (BIG yard) and 24 hours later we had a dead mole.
It was a wonderful (and for us expensive) experience. Go get your nasty little critter with this trap, but don't follow their directions. Listen to reviewer Geoffrey Klos.