Relative to Boker's use of 420 blade steel, and edge retention, I feel you have nothing to worry about. First of all, contact Boker USA in Lakewood, Colorado and ask what kind of steel they use in that model. Next, how many of you people will be doing heavy duty cutting with this type folder, that you have to worry about edge retention? The Top Lock is a superb knife. Not only is it very precision relative to design and construction, but it's beautiful and a joy to hold. You guys are paying a lot more for some other knives that don't have half the class, and their blades don't last any longer. A lot of production companies are using 440 steel in their blades, but don't tell you it's A or B, NOT C. Yes, there is a difference even if it's slight. You want edge retention, go to a tool steel. Your stainless steels work fine, but they aren't tool steels, and you aren't paying tool steel prices.