Specialized insoles are just not remotely the same thing. Their highest arch support is like the minimum support option from g8, and is in the wrong place for me anyway. The Specialized insoles are also too thick and make half my road shoes too tight.
G8 insoles are easily worth it for the comfort they provide. Yes it’s painful to pay that much for a simple insert for multiple sets of shoes, but there isn’t a good alternative that’s close. They solved numb feet for me overnight.