Do you get two for the 75 or 100 dollars? I'm not sure I'd want to wear an insole in just one shoe. EDIT - this is covered in your FAQ, sorry. "Yes, we will pr

Do you get two for the 75 or 100 dollars? I'm not sure I'd want to wear an insole in just one shoe. EDIT - this is covered in your FAQ, sorry. "Yes, we will provide a matching insole with the same feel/weight/size as the power-producing insole so the user doesn't walk with uneven steps." Secondly, why would you advise this over a wind up charger?