FWIW, if it were me, I would personally avoid the junk-ish locking boxes because of serious design flaws and vulnerabilities. The selection process can be complicated by organizations like the CA DOJ, as they have shamelessly given their "child-resistance approval" to many products with serious functional deficiencies that have had (and will continue to have) fatal consequences. IMO a more secure product is a worthwhile investment.
For a locking mechanism, I highly advise avoiding electronic and biometric locks in favor of purchasing a product that uses a mechanical lock, which I feel is a superior locking mechanism in almost every way. It has proven reliability, proven durability, proven longevity, has zero dependency on a battery & circuits, and most boxes using a Simplex are about as fast as electronic-assisted opening boxes. The most common mechanical lock found on pistol boxes are designed to opened hundreds of times daily and run for decades with only the most minimal of service. So it is not unreasonable to expect 2, 3, 4+ decades of service from that type of product...in the long run, that extended service life can save quite a lot of money over the alternative of replacing an entire mini vault due to failed electronic components.
If I were personally shopping for a mini vault, I would also be interested in finding out other design details, such as what type of steel is being used (and how much), whether the welds are deep or shallow, if the door design mitigates the effectiveness of a pry attack, how much brass the locking system uses (superior but pricier choice over alternatives), and what the boltwork looks like. While this type of product only provides the most limited of burglary protection, I do feel that these details can also affect how well (or poorly) a product could resist a child or adolescent from getting inside. For example, the revelation that a huge portion of products on the market can be opened with things like paperclips, pens, and magnets speak to how poor the overall design is. Heck, simply dropping many of those mini safes on hard ground will often cause the (weak) locking mechanism & boltwork to fail outright.
There are several makers producing products that appear to be several orders of magnitude better than the crap that has become the norm. The model I use most is the Fort Knox Pistol Box (the original model, as there are several versions), and am very satisfied with it. With reasonable 10 gauge steel armor, a strong locking bolt, extensive use of brass, & deep welds, when bolted to the floor this provides limited protection from a smash & grab, and there are absolutely ZERO design issues that allow children to access the contents.
While I do not have experiences with the FAS line, from a construction standpoint it uses the design & materials I consider to be optimal for this type of product, and User reviews have a lot of praise for the overall quality of the end products. From an armor perspective, it goes even beyond the Fort Knox. Bolted down, I think a smash & grab burglar with basic hand tools would struggle to defeat a FAS in the short time frame that characterizes many burglaries. That's a nice benefit since 99% of fast-access gun safes can be defeated in seconds by the dumbest of criminals.
Ultimately, I think for not much more you can get something a lot better than you are considering. I believe it will give you optimal safety, reliability, longevity, and peace of mind that none of the electronic or biometric systems can come near.