Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Returned to store

We were'nt completely satisfied almost from the day of purchase. Bought it primarily because of the removable grill plates. We were happy w/ our first GF grill, but the plates were not removable. First concern was excessive preheat time required. We never did cook on any setting other than the highest heat setting. When the teflon coating began to come off the grill plates within 60 days of purchase, we were only too happy to return it for a refund (not a replacement).