For the money, this more than adequate. In fact, it's excellent.It ain't Fort Knox. The efficacy of any security system is in part a function of how much effort, work and time a thief is willing or can afford to spend on a burglary, and we need to accept the fact of life that thieves are looking for a quick in/out when stealing a car, or stealing from a car.As is, the product is excellent, the cable is strong -- I tried to cut it with my hardware-store-bought cable cutters, couldn't get past the plastic/vinyl covering.Two flaws, that may or may not be present in the product you get, depending on when you buy it:1. On the inside of the top cover, where the lock is, the cylinder has a Phillips-head screw that holds a washer and a lock-washer on the tab that swings in and out to lock the box. On mine, the screw was a bit loose. Tightened it just with my fingernail, closed the box and tried to lock it, the lock felt like it was jamming, I felt closing and re-opening. On closer inspection, the tab simply slides in and out of a slot in a metal plate. Tightening the screw, simply raises the tab high enough (by a fraction of a millimeter) so that it creates friction between the tab and the top of the slot into which it's supposed to slide. Tightening the screw properly makes the problem even worse, and the key does look like it could break if you put too much twist on it.Easy fix -- I used a grinding wheel on a Dremel tool, to shave off a bit of the upper edge of the upper slot (there are two slots on the metal plate in my box). Then I tightened the screw properly, and tested, and repeated until the action became completely smooth. If you have to do this, make sure you don't grind-off too much so that when the box is locked, there's enough space between the tab and the upper lip of the slot that the cover "plays" up and down. "Creep" on it and test often.2. The tab itself is shaped like a hook, but it doesn't really hook into anything. It's just the surface of the tab sliding into that slot that keeps the box locked. As such, the hook shape simply decreases the strength of the tab.These two are not major drawbacks, but give the impression that the product was put together in a hurry, with whatever parts were available at the time, and is not in keeping with Stack-On's reputation. That's worth a star in my opinion.I've read reviews where people reported that their box was stolen, and they found a neatly cut cable where the box used to be, in their car. I'm very sorry this happened to them, but the time to close the barn door is before the horse runs away, not after. The first thing I did, was try to cut the provided cable with cutters. Like I said, never got past the vinyl cover.Not satisfied with that, I invested some $7 in a length of 1/4" steel-strand cable, encased in vinyl (which will probably accumulate dirt, but keep the cable from rusting). That, plus one or more (as needed) beefy 1/4" U-Shaped wire-rope clips (which should stay inside the box for security), should give you plenty of options with a much stronger cable. No sense divulging here exactly how I set it up, and your setup will probably be different anyway.All in all, I recommend it, especially if you get lucky enough not to have to correct the flaw with the lock/screw that I mentioned above.By all means, keep a record of the serial number (on a sticker inside the box, under the foam pad) and the number on the key. Stack-on will need that, if you ever need them to provide you with additional spare keys.