That's a good point--but the next one could be better!
There are many ways for feedback on particular products to be registered at Amazon.ca. Certainly our customers are vociferous in their recommendations, both pro and con. So it's very helpful to consumers who shop on the site.
I'm just saying that if you're going to have an implied consent based on a purchase, 18 months just doesn't make sense. It has to be a much longer period for that to be meaningful to consumers. I've thought not only about similar products but also of replacement products, things like electric shavers or headphones with limited lives. You don't want to get an e-mail about the possibility of replacing that product within 17 and a half months, because it better still be working by then, but after four years, that would be a useful offer to receive.