Probably as good as these things get,
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This review is from: Combination Key Safe with Waterproof Cover (Misc.)
The key safe arrived promptly and well packed. The (minimal) instructions were easy to follow and with the aid of a power drill and a screwdriver, I soon had it mounted on the wall.
The reason that it didn't get 5 stars is because there are not that many combinations of codes as I first thought. Each button can only be used once and it matters not in which order they are pressed, so 4231 is the same as 1234. The suggestion is to use a four or five digit combination and I suggest that the latter is more secure - provided that you avoid a sequence that is easy to come upon by random presses.
Apart from that, it seems well made and pretty indestructable without serious tools. A burglar would probably find it easier to break a window than to open the safe