Anecdote: I purchased a dog hammock/cover for the backseat of my car last year and the straps melted over the course of the summer. The company replaced it for free, then emailed me every other day about updating my review... definitely before it'd gone through another summer, but even before I'd actually set it up in my car. I don't feel that a merchant holding up their end of their "lifetime guarantee" obligates me to update my review of their product (though I intend to once I'm satisfied that I've actually used it enough to warrant an update).