Security answers are one of the hardest to answer as I consider nothing secure.
However i can try to give you my feelings on this and these types of devices.
Lets assume this was installed into a doorway to gain access to the door.
One could just rip the cover off and take the module out and hack it. To beef up security on this it would be better to install a metal box from the inside of the room, and only have a square hole large enough for the ID reader itself (not the whole module) to stick through. This would at least keep those from ripping the panel off and taking the module. They would have to cut through the steel box to get to it. If they are going through that much effort they might as well just break down the door as it would be faster.
If one is looking for far better security a better option is to have the sensor only in the wall and the brains located on another floor or room. Many of us are so programmed to think that we need to first attack the sensor on the wall by the door to gain access due to all the movies we have watched in our lives. When in reality the best spot is just next to the door jam where the electromagnet is. Making a hole there to gain access to the two wires to that and giving it a shot of voltage will open the door bypassing the most advanced security protection. But i see now i have gotten off the point.
I am really not trying to give you a salesman answer here, It would all depend on where and what you plan to secure with it. Would i put it on a vending machine in my company yes. Would i put it on a vending machine that is located outside at my local store, no.