Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Beware - the back strap broke on us very unexpectedly

This is a great product that we use all the time but beware of safety defects.This product has been recalled because of safety issues and about a month ago we received the "new & improved", post-recall edition (which was supposed to have addressed the defect).Well, the strap that connects the lumbar support to the shoulder straps just broke on us (Amazon's 2nd picture shows this faulty strap). We were lucky and our baby didn't drop but it was a scary moment and could have been much, much worse.We have a different version without the lumbar support and this model seems safer.