I have been using an NV200 for about three years and decided it was time to get some family members a way to safely lock up a firearm in their vehicle and when they travel. The NV300 is a great upgrade for this extremely versatile and secure portable safe. With it, no key is needed! I love the way the cable secures the GunVault to many permanent locations. Also, it can be mounted with screws or bolts for a more permanent mounting. Highly recommended!