So the idea is to have a small enough footprint that most people with a double garage, detached garage or barn could fit it into. As someone that has spent their life in the trades I do understand that yes it's not impenetrable but considering the time, effort, noise and smoke this would take to cut, burn, hack, or grind your way into it's just really improbable that someone is going to go through the effort and risk getting caught. And that's assuming you went cheap and didn't have an alarm installed into it.
Think of the time it would take to get into ,all while a 150 Db alarm is screaming at you ? And once you cut a jagged hole in it then what ? You *may* get a few guns out but you may also get cut to pieces by said jagged hole in the doing of it or worse, get caught during the attempt because of the aforementioned time, effort, noise and smoke needed to make a small hole. All in all I would say these are better protection from theft than a safe. Also, these don't LOOK like a gun safe. I have two actual gun safes and they look EXACTLY like what they are. Anyone that sees them at my house would say "Wow, nice gun safe"... See my point ? These are far more incognito.
Besides, you can cut into ANY safe if you come prepared and the situation is right.