I have a Sentry Safe. They're entry level safes. It's average for it's price range, it will keep the kids out, and probably deter an inexperienced thief.
The sheet metal on the sides is pretty thin, the door is modular, it will not stop a thief who knows what he's doing.
As far as the fire rating goes, look at how many minutes it is rated for. I think that if you have a full blown house fire, total destruction, your guns won't survive.
And if you don't bolt it to the floor, the thief will just haul it away and open it later.