Cirb Tents Anyone?

So, I've got a little climber on my hands. Lucy is 18 months and has crawled out of the crib and the pack and play. Only once each, but she typically has one leg hanging over the crib when I go to get her in the morning or after a nap. A lady at our community pool suggested getting a crib tent. Does anyone have one of these? They are about $80, which I don't mind spending if they work well, but I'd love some feedback or other ideas. I really can't have her being able to get out of her crib, and her room...