Ive used mine pretty hard for the last 4-5 months. Ive used it to cut everything....sandwiches, fruit, plastic, cardboard, rubber...on a few occasions ive used it on dayhikes too to whittle wood, prepare fires, etc. Its seen abit of time in the kitchen too cutting onions, splitting chicken and so forth.
I dont have a single hard-use story for you. for that kinda use i go with a fixed blade or depending on the task some other tool.
The Tenacious's price tag makes it my edc workknife even though i have other knives that i think are better.
I think its a great knife, but edge-retention is rather poor when used hard. But at the price i cant complain. And besides, its nothing the sharpmaker cant fix in a couple of minutes.