Quick tip - file a taper on the locking mechanism, because it's pretty loose. When trying to close it while stripping off the wire - it blocks you from doing that. Few strokes with a file and it works really nicely. Cutting wire - needs a bit of force but strips it pretty nicely and feels sharp.
Arrived real quickly in it's original packaging. Feels like cheap plastic. Not satisfying to me. The springs are good. The knives seem sharp, though I haven't tried to cut a cable yet.
Just used it to strip a cable. Does it's job real well. The knives are indeed really sharp.