fwiw, I used Kenetrek Mtn Extreme 400s for several years, including one Dall sheep hunt in Brooks Range, and several desert bighorn surveys, plus mule deer and elk hunts. rough on my heels, for me personally. my feet are relatively flat and wide, and my heels are average width.
I got a much better fit with Cabelas/Alaskan Meindl.
As with
BRWNBR, they required virtually no break-in time. Big contrast there with my Kenetreks, which got lots of miles and still weren't a good fit for my feet.
I've used the Meindls on one Dall sheep hunt in the Brooks range, plus bighorn survey, plus backpacking hunts. a good fit for my feet, and relatively light and comfortable and not overly stiff for long approaches on trails or mild terrain.
I've also puts in lots of alpine miles using La Sportiva Nepals - both the insulated and uninsulated models. However, because they are climbing boots, they have a stiff midsole for use with crampons, and that generally translates to less comfort when walking on flat/mild slopes.
Per Shepherd's suggestion above, i'd recommend buying several types and try them at home (without ever wearing them outside so you can return them).
my suggestion for trying the boots (and also for sheep hunt training) is to get an aerobic "step" (at Big 5 sporting goods), put a full pack on, and then step up and down while watching TV, including stepping onto the step sideways, to simulate sidehilling.
when training for a sheep hunt, i've proceeded with the mindset that if i have any time to watch tv, then i have time to train. fwiw, using that stepper with steadily increasing pack weights and stepping times, it's been relatively easy in my experience to get in the appropriate time and type of training, including for the (hopeful) packout of an animal. GLWYS.