I've had two Mora Triflex Craftsmen. I like them a lot. It'd probably take more abuse than I've yet dished out to genuinely trash them (paging Noss4 -- maybe he could see what it takes to destroy a couple of each model of Mora knife)--but here are my observations about the steel. It seems strong enough--I've batonned the blade through inch-or-two-thick hardwood, with the only damage being that an invisibly-small wire-edge-like bit at the very edge apparently rolled and came off. I couldn't see it except upon extremely close, "hold-it-up-to-the-light-and-squint-at-it-from-a-couple-of-inches-away" examination--just a little area of the blade that was suddenly dull and almost microscopically lower than the ridge of the edge, whereas the rest was still hair-popping sharp. Here is what I think probably happened: people with a lot of Mora experience maintain that the polishing of the blade in the factory softens a little bit of the very outside of the blade, and this will include the extreme edge on a very new knife. To get to the truly hard part, they say, one must sharpen enough to get through the polishing-softened part, and one will suddenly find the steel is a lot harder. I think what happened to mine was that the (pretty abusive) batoning wound up deforming the very edge of the knife, so that the wire-edge-like bit broke off. I sharpened it out right away, and had no further problems--and, I'll say, I still have high confidence in the knife.
The other info I have about the steel is that I tried darkening it by leaving it in vinegar for several hours or overnight, and observed that while the beveled part darkened, the rest of the blade (toward the spine) remained lighter-colored. I think this might be consistent with a differential temper with the hard part coinciding with the beveled part of the blade.
I like these a lot; gave one to my dad for a survival kit when he was headed to Central America on a medical mission; got another immediately because I think they are a candidate for best Mora for everyday-wilderness-carry. The scabbard, for instance, is much thinner than other Mora scabbards (e.g., Clipper, Mora 2000)--so if you're making, say, a neck rig with other gear attached to the scabbard, it'll keep the overall kit more thin and manageable. Second, the lanyard hole on the Craftsman lines up almost exactly with a widening in the belt-slot for the scabbard, so that if you like you can take a mini-carabiner, loop it through both the knife's lanyard hole and the widened part of the belt-slot for the scabbard, and effectively lock the knife into the scabbard so that it cannot come out if you roll down a hill, fall out of a tree, etc. (You can also remove the carabiner at will for quicker access.) Third, the handle is tough plastic, so any concerns about wood getting weakened by periodic wetting and drying--or drying out if the knife is part of a vehicle kit and subjected to constant hundred-degree fluxes in temperature, are non-issues. (I live in the desert; air temperature in the shade has sometimes reached 120 Fahrenheit, and in a car parked in the sun it can easily get to 150 or so, I think--and in the winter you can predict sub-freezing temperatures, as well--so any equipment I'm leaving in my car has to be able to put up with major changes on an ongoing basis.) My main issues with the handle: it's on the fat side, so the other people in my family (who are quite small) may find it less comfortable to use than, say, a traditional Mora or a Clipper. It also comes dangerously smooth and slippery. After a very little trial and error, I have discovered that taking coarse sandpaper to that slick handle very quickly roughens it up to the point where it's as grippy as a rubberized handle material like Kraton, even under soapy water--so my earlier concerns about cleaning fish with it went away.
Finally, it's a heck of a deal for 11 bucks.
People use them for skinning game, opening cardboard boxes and what not. It's almost impossible to find knives that are any cheaper than basic Moras here in Scandinavia - your basic Clipper is anything between 2 to 5 euros, so it's practically free. They're cheap, realistic and practical user and beater knives. People do stuff with them that they'd never do with more expensive blades, because they can just throw them away at will and get a new one when they feel like it. They won't perform like a Busse or other "bombproof" knives, but they do work, and can sometimes take a surprising amount of abuse. But they're certainly not indestructible.