Watch all the videos on YouTube about people cutting into them with a grinding wheel and you'll feel like most all of them aren't as secure as you think! The door and bolts mean nothing when the side of the safe is only 10 or 12 gauge metal.
I bought a Cannon from Tractor Supply last year and it was so heavy we couldn't get it in the house. So I decided to remove all the sheet rock from inside of the safe to lighten it up a bit. It's just stacked in place and lightly glued, so it's easy to get out and back in. Once I got it all out, the safe was nothing more than a very large filing cabinet! I could've probably moved it in the house myself! The sides were so flimsy that you could slap it with your hand and they would vibrate like sheet metal. Needless to say I took it back.
Moral of the story, do research and find one with the thickest metal possible in the sides, and body of the safe. Also bolt it down, and try to put it in a place that's hard to access with a grinder or pry bar.