Just remember that biometric safes all require a LOT of batteries. And also remember that batteries tend to have a GREATLY reduced lifespan when subjected to high temperatures--like INSIDE A CAR in the summer. Rechargeables are even more susceptible to this than alkalines or Lithiums...
You can plan on spending a few hundred dollars over the life of the safe on batteries, and have to occasionally use the key to open it because the batteries died unexpectedly, and adding a few hundred to the price of the safe for the privilege, OR you could get a plain-jane keyed or combination safe, and save yourself a lot of hassle, expense, and maintenance in the future.
Just my opinion, though...