These popped up around the 2015 holiday season, and there was quite some buzz on Youtube and on the various forums when some of them turned out to be decent knives--for the materials, of course.
If you were too lazy to read the BF thread that NJBillK linked to for us, a couple of the big takeaways:
- The "$2 deathtrap" model is not part of the new line, and is supposedly being discontinued.
- Quality definitely varies from model to model (the tan flipper is by most accounts the best one), but apparently the $4 line is getting some personal love and attention, and it's not just rebadged OEM crap.
On my last trip to the U.S., about six weeks ago, I found myself in a small town in New Mexico needing a tire patched. Wal-Mart it was, so while the auto center saw to that I headed to the sporting goods department to amuse myself--and, yes, see if I could find one of these things. Unfortunately, they didn't have the tan flipper, so I settled for the Buck 112 clone. (I mean, would you really pass that up?)
I didn't actually open it until a few weeks ago, but I have to say that it surprised me despite the built-up hype. Authoritative lockup, zero blade play, and paper-cutting sharp out of the packaging. I haven't used it enough to dull it yet, but I imagine it would do so quickly and then take an edge back in about two minutes.
Anyway, you guys can go back to looking down your noses at the "people of Wal-Mart" and rejecting out of hand something you've never even seen, but $4 for a cute little throwaway knife is a pretty good value, IMO.
(As for travel: What TSA should do, rather than sell confiscated knives online in lots, is set up vending machines outside arrivals at which, for a couple of bucks, you'd get a random knife dispensed blindly. This is the next best thing--that is, next to sensible security policies, which we know won't ever happen. But I digress.)