Weight is a major deterent, I'd say most recommend a minmum safe of 500 pounds. The concept being 2 guys ain't just picking it up and walking out.
Fire safe(s) seem to have those that love them and those that say waste of money. Either way if fire hot enough you will have internal water vapor in the safe to contend with. If I recall correctly from reading a technical article about fire safes, your guns, negatives, backup CD's, etcetera will look like someone sprayed water inside on them.
If I were to do it again I'd forget the frills and fire proofing and the rest of it and get the biggest internal size my money would buy. I have (2) five hundred pound fire safes and (1) three hundred pound fire safe. I brought the 500 pounders in myself on a dolly.
I had all I could do and I'm used to handling extreme weight. I took off one door knob in the process, snapped it clean off and barely touched it...watch your hands!!! I seriously doubt even 2 crack heads could handle getting them out with a dolly. And if they do the guns are fully insured under a floater with my house insurance. Which I might add also covers theft in the field and or loss of firearm say from a boat capsizing etcetera.
Before the safes I had false walls I hid my firearms behind.
Do something though. I have run into a few guys at the range, particularly, those that live in the boonies, that have been broken into? (doors not locked!!) and had firearms stolen. The thieves simply walked out with the guns in their hands. It was like stealing candy from a baby. No protection, in the open, on full display for any loser to only have to take 5 mins from the time they pull into the driveway, walk into the open house, quickly scan all the rooms, gather up a armfull of rifles, and pull out of the driveway.
I have a Sportsmans, Liberty, and a Brinks. They're medium? priced basic fire safes. They all come with carpet and shelfs, but I ended up tearing out some of the shelfs in all of them for more space. Never seems to be enough space in them.
They fill up very fast. This internal design sucked for firearms, but the other two I have are no better. I think the best would be just a fully wide open space the bottom three quarters of the safe, but as you can see where do I put my papers, film, etcetera? I need a fourth safe just for them. The wife would kill me!!!!!