My defintion of a hard use folder is something with a strong lock up, strong blade, usually large and will take whatever I throw at it (in general knife use)
I am a marine technician and carry a knife all the time. When I am looking for a knife I want it to be able to do all the things I might come across on a daily basis. I use my knives at work, camping, boating, hunting and just about anytime I need it. I will be using it for chopping small trees, batoning wood, stripping wires, cutting wire ties, scraping fiberglass, a screwdriver if I have to and whatever else I need it to do. I understand that there is a line between "hard use" and abuse, but if I need my knife to do something I want it to be able to do it. I have been using a Benchmade Griptilian on the job and it works ok, but I have broken the tip off twice now. Once cutting a wire tie against a piece of metal and the other cutting a rubber hose off a metal niple. I do not think of this as abuse, but normal use. I feel that having a stronger knife such as a strider or something this would not have happened.
Also the list that I made were just some of the folders I was looking at, to add a few more here they are.
1. Chris Reeve Umnumzaan
2. Hinderer XM-18 (If I can find one)