I just bought a pair of sandals with 3.5" heels. I find them about as comfortable as a pair of 3.5" heeled sandals can be which is actually pretty comfortable! The only problem I have is that the ridged grippers on the bottom aren't really ridged. They are horribly slippery! I'm hoping the usual wear and tear of wearing them will provide some grip eventually.
I got a pair of the motorcycle boots and the sizing was weird it fit perfectly on one foot and was too tight on the other foot. I have never had this problem with any brand I have tried be it ALDO, Ninewest or steve madden.