I started wearing the Targhee II about 7 years ago. I've had a couple of the low, but the mid is my all time favorite and I've had more than a couple of them. I live in Alaska and this boot really gets a workout. I wear them basically non-stop from October through March in some pretty sloppy, wet, snowy, icy conditions. They haven't failed me yet. I still wear them a lot in the summer, but more actual hiking and longer dog walks. I love the thicker soles as they really do a great job of protecting my feet from rocks and the ever present gravel. These fit my feet so well. I do buy them a half size larger. The arch support is perfect and in the exact right place. They are always comfortable right out of the box. I've tried the Targhee III, and they're ok. I think the fit is a bit different -- possibly a little narrower and the soles aren't quite as thick. So, this model remains my favorite and I really hope Keen doesn't decide to discontinue it!