I've got one that came in a used Tacoma I just bought. I'm still undecided.
If I were carrying around tools all the time, it'd be great. It's pretty secure when the tailgate locks. I do carry tow straps, bungee cords, jumper cables, tools and the like in them. Stuff that isn't kicking around the interior of the cab as in previous trucks
The downside is that it isn't a very efficient use of space as the drawer volume is only about half the total volume. I still haven't figured out how I'm going to get trash barrels to the dump, but I think I can drop the tailgate and ratchet strap a couple of trash barrels, supported on the tailgate.
Only time will tell.