I guess it depends on what you mean by hard use. I've had, and carried, the combo one for ~ a year in my back pocket, with the clip removed. I've used it for;
letter opening
cutting cardboard
cutting plastic (ty wraps)- serrated section works great.
carving a wedge
etc., etc.
I wouldn't attempt to cut through a 2x4, or any like task, but I've had no trouble with the knife & still carry it on a daily basis. With the clip removed it has a very slender profile & weighs < 2 oz, perfect for my needs.
Hope this helps, but "hard use" is subjective to the knife user, IMO.