If you have sore feet these are fantastic - I temporarily had a Morton's Neuroma type condition and these were amazing in letting me feel normal, and walk about without pain. There is an elevated dome of gel behind the metatarsals(just like what the podiatrist made for me), that some MIGHT find annoying, depending on your foot problem, but should be able to shave off with a razor if needed.
That said - long term use might not be good for your feet (see Superfeet webpage), though really after you browse enough on pros and cons of shoe inserts, you'll find lots of folks who say you should be as close to barefoot as possible, and that ANY shoe insert only weakens your feet further. For temporary relief these are great, think about strengthening your feet with specific exercises if you do buy them and only use temporarily.