I have pair of heels that I love, but they really hurt my feet after an hour or 2. I tried out the ball of foot inserts on my 10 year anniversary last weekend. These are a lifesaver. My feet didn't hurt at all. We did some standing and walking that normally would have had me in bare feet in these shoes. These inserts really did the trick. I really love that you can transfer them to another pair of shoes but I can see myself buying a pair for every pair of heels I own.
I am going to recommend these to the bridal party and the bride for the wedding that I'm in. I love that they are clear and they didn't damage my shoe. The other inserts I've tried had double stick tape and you couldn't adjust them once they were in the shoe. Others that I tried slide around or change the fit of your shoe. These stuck to the shoe perfectly and didn't slide at all, but you could move them if you needed to make and adjustment to get them under your foot to get the perfect comfort. My shoe still fit perfectly and I didn't even notice they were there.
Bottom line if you love heels, you need these inserts. I'll be picking up a few pair to add to my work shoes and my fun shoes so I can finally wear some of the heels that I love that are painful to wear.