I'm glad this thread was started.

I actually use 3 pairs of boots depending on what I am doing.

AXO Boxer MX Boots (Mucking about in dirt), Forma Adventure Boots (Long trips over varied terrain), RJays Aquaboots (Road Riding). Not happy with the Axos (very stiff in the ankle to shift gears; I badly broke my ankle and it only has limited movement now). The others are great for what they are designed for.

So, my questions would be: Are the Sidis worth the extra money, and will the hinge mechanism help with shifting? And are there any comparable boots that offer MX levels of protection with good movement at the ankle?

Cheers, Boneman