I think S30V was once hyped as being stainless 3V before it came out, not by Crucible but by one or two knifemakers. S30V has wear resistance between 154CM and S90V (which is pretty high), it is fairly difficult to sharpen, and has toughness between that of 154CM and D2, closer to D2. However, some production companies have had trouble heat treating or grinding it (which re-austenitizes the edge without tempering, a couple shapenings generally gets rid of the issue) and there have been reports of chipping. I don't think it is as much a problem of the steel as neglect by the production companies, and S30V's hype as a super tough stainless meant people actually used them, and the improper heat treatment and/or grinding was readily apparent. Some people have gone so far as to say that you shouldn't purchase a knife in S30V at all, as for me, I'm not so worried. My S30V knives have all done well. I hope to make knives someday, but if I test them with different heat treatments and other steels, then I'll steer clear of any problems.