I was in Las Vegas and had my valuables in the room safe. Couldn't for the life of me remember my code to get in the safe. Security came in, hooked up a little machine to the safe and opened it right up. It even told me what my code was. After seeing that it took them about 3 seconds to open that safe AND know the code, I don't use them anymore for anything other than non valuable stuff I just don't want laying out anywhere.
I use the front desk for anything else.