They're good knives, but not prying tools or any such thing. Designed for wood working and general use, like skinning critters. Cut well, easy to sharpen, not very expensive. Much higher quality than any Mora, ever.
As for the handles, treat the handles like you would treat yourself. Puukkos are supposed to go with where you go, except underwater. You don't leave yourself for hours in a burning hot car, so don't leave your puukko there, either. You don't toss yourself in water without drying yourself when you come out, so... The handles used in puukkos tend to hold up better than people expect, in general. But since they're usually natural materials, they do not love water or excess heat. You don't really need to treat them with any oil or coating, just keep them reasonably dry.
I have to say the grinds weren't perfect when I got it. They don't meet at exactly the same point toward the tip.I was a little dissapointed in this at first but it hasn't seemed to make much difference sharpening.It is very easy to get a razor edge and holds it pretty well.
Quite frankly, that's to be expected with almost all puukkos. The hand-made ones in particular practically never have a perfectly even grind. Not that this matters anything at all with regards to performance, as you noted.

Uneven grind lines aren't exactly rare with other knives, either. About the only blades they're typically not found on are machine-made, mass-produced folders, and the 300+ $ blades. I've seen uneven grind lines for example on Fällknivens, Busses, every single brand and maker of puukko I've ever seen, all sorts of custom and hand-made knives - no effect to performance in any of these cases.