I found Scholl Party Feet Gel Cushions straightforward to apply, although I needed to re-stick them a couple of times to ensure they were exactly where I wanted them to be. I imagine this would have been much easier if the shoes weren't partially closed.
To test out the comfort level, I wore my heels out on a day where I had work and a social gathering afterwards. Despite wearing heels for over 12 hours straight, I felt no pain in the balls of my feet. It was like walking on a cloud. My toes did feel a bit pinched at the end of the day, but that's not the product's fault!
The packaging states that the product is washable and reusable, but I haven't tested this out yet. I would definitely recommend the product based on my experience so far though.
I absolutely love these I usually dont wear heels because they hurt too much for long wearing, now I can last hours wearing my fav heals