As I posted on 5-9-16, I tried them and like them. I bought another pair then, and last year (2017) bought 2 more pair. I wear them daily, and they seem to hold up. Not sure why their website says to change them every three months? I ordered two more pair Monday July 2nd, and received them today. I put the new ones in my daily wear work boots (Salomon 4d). I write the date and year I buy them on the bottom of the insert, and rotate the older ones into gardening or casual shoes. I still have the originals, and they still seem to offer support.
Heelthatpain.com has a special right now, if you buy a second pair, you get the second pair at 50% off. Total for 2 pair cost me $52