How well do these work?

I am really interested in hiding my valuables in plain sight, so I really like the idea behind diversion safes. However, do these really work well? Has anyone who uses these been robbed? Did the thieves find the valuables you had hidden in your diversion safe? I am just worried that they won’t look quite like the product they are imitating, or that they will feel different or something and someone will find and take my valuables. Maybe I should just get a safe deposit box or a real safe. I’m not sure where I would put a large safe though.