I have one of those. While it does hold an edge quite a bit longer than does a knife with a standard S30V blade (for example my BM switchback), I would not classify it as an outdoor survival knife. I read the articles, and I am sure that Tom Brown knows more about wilderness survival than I do--BUT I have been out in the woods/desert/jungle quite a bit, and I would rather have something with a little more oomph to it than a WH. If I could only take one folder, for example, a MT LCC / Spyderco Chinook or Manix come to my mind, as well as the ones you mention. Yes, they weigh a lot more. However, I would put up with the extra weight of the knife and trim down somewhere else.
Maybe I'm too reliant on heavy, large folders. So be it. Anyway, I niver carry only one knife anyway.
Back on topic--the Quest is a nice little knife, and does it's job quite well. Is it worth the price for this steel? Up to you.