I'm a fan
I've used these for the past few years, even before they were available on Amazon when you had to pay for shipping: that's a testament to a good product.  They reduce odor noticeably and can be used more than once (despite what the packaging says).  They are thin enough to not affect shoe fit and now come in a few colors.  I only wish they had some non-slip mechanism on the bottom, they tend to slide.
Rating: 4 stars