Coolo, I have some Sidis too, love them. Those have the replaceble sole section, nice boots. At least there is one item of my gear not made in China, gotta love that.
Only thing I don't like about my Sidi's is the fact that they take a while to put on. Every thing has to be lined up perfectly. They are in my opinion the best boots made. Every piece except the leather is replaceable with screws or bolts. Any gear head should appreciate that!