I've now had these insoles for just over a week, and they have now compressed down to not make any difference.
I have purposely waited to write a review for this exact reason. Brand new, the insoles feel very comfortable and I was very pleased with the items given the price. I only walk approximately 1-2 miles a day, and at around day 5 the insoles are completely compressed under the balls of my feet they provide no comfort at all now.
I'll be putting in the 2nd pair I received and then looking for a better quality/longer lasting insole.