Liked my first pair of TCX RS race boots so well,I purchased S race boots on sale and also the same model in the waterproof version!
The torsion control frames squeak like crazy when I walk around at first and the foot bed material,when exposed to rain,developed an odor requiring removal on my first pair,but other than that I find them to be of the finest fit and finish.
They're true to size and well ventilated.Metal grate and vent at sides of sole work almost too well on cold mornings!
Soles aren't replaceable according to TCX so I'll check out what my local shoe repair can do for my first pair when they finally wear thru,I'm talking about a year and a half of daily wear and walking!
My toe and heel sliders are metal and unscratched so that's not a replacement issue for me.
The first pair were what my dealer had,were top of the line technology,were white and matched my bike.
I've never owned Sidi's,but I do admire the replaceable parts ability.