Definition: In this task, you're given reviews from Amazon's products. Your task is to generate the Summary of the review.
Input: This product was great, until it wasn't. I bought it to carry my cellphone in while I walk my dog. The zipper blew out and I can't get it to zip properly. Totally useless now. Waste of money. :-(

Zipper blew out shortly after the return period expired...of course.