It would be better to see them in person. I personally do not like a boot with a "sticky" good tread. A sticky tread on the sole, means it also doesn't slip out of the stirrup easy if you fall off.
Granted, this is an endurance boot and lots of endurance riders use "cages" on their stirrups, so their foot doesn't go through the stirrup, but also makes it more comfortable on long 50 miles rides. (I know this because I board with a serious endurance rider.)
So the endurance boots paired with an endurance stirrup is fine.
But would I wear these boots for riding in my western saddle, with a "normal" stirrup? NO.
But to each his own.