I agree stay away from the quick access ones. I have a gunvault also. Batteries died and I could not get into it. Luckily I found the key to it. Why not just go with a security cable and a padlock. About the best budget good security that you can get.
Bolt cutter? Inexpensive tool, about a second to get through. Terrible security, even at the price.
I've never had the battery issue that people are talking about in the electronic safes. But now that I'm reading this, I might up my battery change schedule to every 3 months, instead of 6 months.
HINT: If you're waiting until your battery dies to change it, YOU'RE DOING IT WRONG.