I used one of those on a garage I rented, it worked ok but then again no one attempted to break into it. They do advertise the fact that there might be something inside thats worth a look though. I concreted mine into the ground and used longer bolts than those supplied.
When I stopped renting I was lucky in that the new tenant bought the lock off me.
However, I've since seen vids where people have smacked them with a sledgehammer and it's game over. Either the bolts lift out of the ground or the top "tube" part comes away from the weld to the upright
I now have an internal shutter inside the garage, similar to what shops have when they close up at night. I picked it up second hand off ebay and adapted it. Basically a second line of defence which to be honest is stronger than the main garage door.
I'm sure a determined thief could get in but what you is buy as much time as possible. Key thing to remember with any security is that it is all dependent on the weakest component. Also, a thief won't give a monkeys if he bends the door or breaks anything.