I have been wearing height increase shoes for 20 years. Among other companies, I bought several pairs from tallmenshoes.com, and compared to what is one the market they are all good quality, and fit well.
One month ago I got a pair of nice sandals but the size was ridiculously big, 2+ cm compared to what is written on their size chart for that size; the box stated the right size but there was no size marked anywhere on the shoes. When I emailed them they told me that since that was the size stated on the box, that is the size of that style. So I got a refund. Which means that now I am out of the cost of shipping(as I live in Canada and free shipping does not apply) plus the cost of mailing back the shoes, a total of some $50, which is half the price of the shoes.
It is a matter of luck, seeing other reviews.