I just bought a Milwaukee Hardline 3" knife, and I thought I would post a few thoughts, partly out of frustration.
The knife typically goes for $70, but there was a special deal at HD for $25, so I picked one up.
Out of the box, it was sharp but not quite the way I like it. A few licks on a stone made it shaving-sharp, as expected.
I say “as expected” because the big attraction is the blade, which is made of D2 tool steel. It is supposed to be hard-wearing but relatively easy to sharpen. The downside is that it is less rust-resistant than the “stainless” steels.
The action was a little stiff, but that’s typical with folding knives. I lubed it with some Triflow, working it into the bearings and wiping off the excess. After working it for a while, the action became smoother. But even so, flipping the blade out isn’t a sure thing. Even a firm flip with the index finger doesn’t always make the blade swing out far enough to lock.
In the hand, the handle is relatively broad and flat. That is good for taking up less room in a pocket, and less good for ergonomics. But the kicker is that the handle is about 1/2" shorter than ideal. I don’t have huge hands, and I am only 5’10", but still the handle feels short.
Otherwise the construction feels solid. Lockup is tight, and there is no blade rattle when either locked or folded.
So to summarize, the knife is sturdy and promises to hold up well. It is easy to sharpen. But ergonomically, it isn’t perfect. The handle is a skosh too short, and the flip-out action isn’t reliable, even when lubed and broken in.
If I needed a knife at a jobsite, I would probably buy a few Morakniv Companions (4" fixed rustproof blade.) MUCH better ergonomics and only $12 each. The downside is that in most cities, they aren’t legal to carry in public, so they would have to stay on the jobsite, in a belt or in a toolbox.