I have a black chive, and so far give a big thumb's-up to both boron carbide, and the chive itself. I carry the knife in my watch pocket, and it's what I pull out whenever anyone is watching. It gets used for a lot of light jobs (opening mail, etc.) but also some almost-medium-duty jobs (breaking down heavy boxes, etc.).
I've found that the ergonomics are surprisingly good for such a tiny knife. I thought I"d barely be able to hang onto it at all, and in fact it's quite comfortable for even the harder uses I put it to -- it's got curves and grooves in all the right places. The boron carbide coating is pretty impressive as well -- not a single scratch yet, after several months of use.
Considering the price, it's a good value.
Joe