i've got a mini-grip in n680. i happily overpaid on the BM website to get what i wanted - forest grn handles, silver hardware, n680 blade, sheepsfoot with spydie hole. great knife for me
i've had it for about 8-9 months now, took it out on the boat a bunch, had it in my pack for flyfishing (where it got soaked a lot).
kept it's edge well. i've touched it up just because, didn't really need to. and i haven't had to sharpen it yet, but i didn't beat on it. regular slicing/cutting stuff.
and zero corrosion spots. i got it to get wet. not sure it's way way better than 154cm for that, i don't really get any corrosion spots on that steel either, but i figured i'd do n680 just because, and i've been perfectly happy with it.
disclaimers - i live in eastern WA, pretty dry climate - so wet to me = not for very long, and not sitting in saltwater or anything like that. i have taken it to the coast, to the beach and purposefully not done anything other than rinse it in fresh water at the end of the day, still zero corrosion spots.
i've been happy with it, steel and corrosion -wise
ETA - i also put an STR low-rider clip on it to get it to sit lower in my pocket. like that a lot also, if you decide to go crazy with it....