A couple of quick points, if you decide to get one.
1) Confirm that the location you want to put it was truly framed 16" OC with the studs (so you have 14-1/2 clear between studs). Carpenters sometimes move the studs around when framing, specially if you get close to a corner of a room.
2) Make sure there's no plumbing or electric in that wall cavity. Plumbing is usually easy, cause you know where your wet areas are. Electric can be a challenge, as sometimes wires are run between outlets, and you could have a circuit or pass-thru wire running in that wall cavity.
Lastly, it's only 4" deep, so only narrow firearms will fit. Some ammo boxes are too wide to fit in.
Also, I have the key only version, not the digital. Having the digital version wasn't important to me. I'm just as quick with a key, and the battery on the key never dies out.