I use Cuddebacks. We use to have issues with other people sneaking in on our land, but these things lock on and it makes things near impossible to take. Although, if someone wanted them bad enough nothing would stop them.I would recommend the no flash version. We've noticed that the smaller deer don't mind the flash, but we only get the big ones on film once. Yes, Cuddebacks with no flash are a little more expensive, but worth the money.