No question these are a well-built boot. They are as solid as a zombie apocalypse bunker. When they say flex 130, they aren't joking. This is a stiff boot. But it holds like it should. The grip sole on the bottom is great when walking on ice or packing up to a nice little drop. Buckles are pretty standard but definitely of sound quality. Liner is smooth and supple, helpful in wrenching these Iron Man stiff boots off your feet.
Taking the obvious stiffness out of the equation, this seems to be a rock-solid boot. The liner is plush but well-crafted, I don't see that wearing out any time soon. I would argue these are build more with durability in mind than comfort, seeing as it is a race-quality boot. The foot pads may wear more quickly than your average boot due to the softness the rubber, but they are replaceable.
This is a high-quality boot that performs its function well. Being arguably the most important part of your whole setup, they will keep you in place like they are supposed to. The one thing they are not is cheap, so some might argue that they are not a value buy. While that may be true, these are a boot that means business and is made well so they are worth the money.