FWIW:
I throw all vehicle recovery/tie down stuff in the right drawer of the Decked (at this time... my layout is constantly changing by mission set and time of year). Not as portable as an ammo can (but $25 for a 30mm can? I remember when the .50BMG cans were $5... and just for reference Harbor Freight has some decent quality 50cal ammo cans for $16-ish dollars or less on sale for those interested) but I can't fit all the recovery gear in an ammo can, and I'm too short to reach into one of those boxes that sit up by the cab. Decked does take up a good deal of room in the bed, but with a cap, it's not bad at all. You can fit a lot of stuff in there, everything pictured below and then some. (I don't carry all that every day. Also, the image appears compressed horizontally so the SmartCap looks taller than it is.)
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The Decked drawers aren't what I would consider "secure" even with the "locks" you can buy for it, BUT, it's more secure than just the truck cap on its own and probably comparable to some of the other bed box options out there. I would like it to have more storage/drawer space compared to the amount of room it takes up.
I know people probably aren't going to steal ratchet straps but if they see a rifle case or ammo can (if you have windows in your cap), they might risk stealing that. Heck, a friend of mine had a diaper bag stolen from her car because they probably thought it was a purse... hope there were some dirties in there! Out of sight, out of mind and all that. And I understand that these things may be under a tonneau cover so that mitigates the risk too.
I'm sure there's some degree of selection bias on all sides here, but I do like the Decked drawers (I better like them for what they cost...) I've built boxes/drawers for my previous trucks and it's been nice to have everything lockable in a big box inside a lockable vehicle.