We just got these carts a few months ago, and I pretty much like them. I like being keyless!
The only downside I see is if your code is stolen, but I don't keep mine written anywhere, it's long been memorized!
It's also important to remember to secure the cart when you are done. Otherwise it's still your code in it for everyone else to get stuff out.
MarcusKspn, do you have 2 codes? We have 1 four-digit code to open the entire cart, and another three-digit code that opens narcs. The narc box alarms if it's open for more than a 2 minutes (which really sucks when it comes time to count narcs!), and automatically locks when it's shut, so it can't be left unsecured.