I'll weigh in on this, although I have no HEST experience so I'll just tell you what I know about my Izula so far...
I've had it for just over a year now, and it has replaced every folder I own for an EDC blade. My line of work is mostly outdoors/machinery stuff. Work and live on a farm, and I have also worked on a state park for the past several summers. My Izula has been my primary fishing and hunting knife for the past year. Not a butchering or filleting knife for sure, but for field dressing and skinning it can't be beat. It is perfectly adequate for processing small game though.
It has taken all abuse I have thrown at it on the farm, including light prying, cutting everything from bale twine to soybean stalks plugging the combine to hydraulic hoses and it has not chipped or rolled an edge. I have also cut root balls, silt fence, erosion matting/geotextile, and all sorts of other unmentionable stuff.
I also use it all the time in the kitchen on the basis of handiness. It makes a fine paring knife. Have used it to prepare countless meats and veggies.
I have carried it as a primary backpacking/hiking knife on a few occasions and it did not leave me underknifed, I feel (although I usually carry a 3 along on most hiking/hunting trips, as the extra length is often appreciated there).
Did put the scales on it earlier this year, and that seems to have done well to it as an all-around EDC. The scales are just slightly thicker than the sheath and add a lot of comfort during use.