Your review: You can use some bait, fruit or peanut butter works well. Place just at the air hole at the end so the smell entices them.
Pros: Easy to set, doesn't crush your fingers like snap traps can, re-usable, not "tunnel" construction as some models are so allows the gopher to walk on the dirt as they don't like the tunnel models. I borrowed my neighbors and it worked wonders. Now I'm buying a few of my own as I have 23 acres and animals so I cannot use poison.