ranger's pretty close. he's only had something like two knives he's had to replace under warranty. shivs, i believe.
their are many knives that are tough enough and rangers are one of them... as far as being pushed to their limits... I doubt their as tough.
not saying you could break one during normal use though.
just saying their not as tough as busse's. (which is more than is USUALLY needed)
since I've thinned out my rd9's edge, I noticed a tear in the blade, (although I'm pretty sure it came from a nail I hit with it) which I've never had happen before (my DFLE has rolled it's edge, but never a tear) to me.
also, he has had broken rd9 tips (someone [I think it MIGHT have been gravelface actually] stabbed it into a piece of wood and just pried over with the knife and the tip broke) but only a shiv that snapped in half.
anyways, yeah, I think busse's strong suit is definatley their hard users.
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(although I think INFI makes a great slicer... especially with the thin designs jerry has been coming out with)