...I don't know how you got this impression but it kind of brings us back to the original topic of this thread.
First of all you say "Hard Use Knife". This seems to be a new catch phase, I'm not sure what it means. What makes a knife "Hard Use"... ...what is "Hard Use"??
Then you say "I think this would perform well under hard use". What makes you think that? Is it the size? Weight? Blade thickness/design? What is this knife going to be better at than another good 4" folder... ...say a Sypderco Endura, Benchmade 710 or Griptilian, etc.
It's all about "Perception", or what you "Think" the knife will be good for. "Terminology", making you think that you need a "Hard Use" knife for opening your mail. "Reality", the reality is that we buy this kind of stuff because it's cool and because we can. We can live without $300 overbuilt knives, it's all just marketing and creating a perceived need for a product. If you want to see a real "Hard Use" knife stop a local farmer, fisherman, mechanic, etc. Chances are they have a knife that they've subjected to harder use than I ever will... ...chances are it's a Buck or a Gerber, etc. and does the job just fine.
I should also confess that I've been suckered in by the marketing and am still looking for the perfect "Fat, Heavy, Ugly" knife (or "Hard Use" if you prefer). The only other manual non-flipper ZT is the 0550 which is only a 3.5" blade (far too short for opening mail and other "Hard Use") but it's pricey and I still haven't found one. Currently I'm considering a Benchmade 275 Adamas

I think the 4" blade 7.7 oz 3/4" handle ought to be well suited for my needs, it also seems like a bargain compared to the 0550.