I had no issues with the seller of this product.  Fast delivery, no issues there.  The product itself is not made very well.  The stitching started coming loose between the toe of the sock and the strap after the first night's wear.  I didn't have it over-tightened either.  I tightened it exactly as the directions suggested.  The other issue I have with the sock is that it pulls your toes back, but not from the ball of your foot.  The foot itself can still flex.  It seems it would be a better design if the tension was applied across the ball of the foot, and not the toes.  Rather uncomfortable the way it is designed.  All that aside, it did help some.  I wore it several nights in a row and it did help alleviate the heel pain I was experiencing in the morning when first applying weight to my foot.