I would consider these as replacements for worn out original insoles but not much of an upgrade. They are very thin and as the other reviewer said, offer no arch support, aren't moldable at all, etc. Just be aware of what you are getting.
I am on my third pair of Sidi and cannot say enough about the shoe quality but this insert under whelmed me. For the price they really did not do anything that the old ones did but I guess the smell better.
Not much to say here - these insoles feature a metatarsal reinforcement and anti microbial treatment (possibly some more heel support) vs. the stock insoles. Sidi insoles are kind of a joke and these should come stock on a [$] pair of shoes, but I digress.
Bottom line, if you need some metatarsal support get these, they are cheap and fit perfectly in the shoes. If you need tons of options for arch support, look elsewhere.