We stayed at CSR this summer and had no problems with the safe. As Winka said, they are very small, about 12"x 12"x 3" deep. Just remember to take your stuff out at the end of your stay.
...I figured the in-room safe would be safer than leaving my extra money in the car, so in went my wallet and car keys. Wouldn't you know it, we drove all the way into Georgia on our way home before I realized I left them in the room!

(I checked under the beds 3 times, but forgot about the safe!) Calling the hotel directly, I talked to a CM with a very thick accent, but assumed everything was taken care of. When nothing came in the mail after about a week I called again and got things straightened out. I had to pay for FedEx, but otherwise it all came out perfectly. Not a thing was missing, and included with my items was a copy of the papers they sign (2 CMS) when opening a room safe to get things out, with everything inventoried.
I would feel perfectly fine using the safe next time, only thing is, I'll make sure I empty it before I go home!
I mailed them back the key after I received my things, including a good report about the honesty of the 2 CMs who got my things for me. I would hope all resorts have the same procedures and honest CMs.
Lynn