I’m sure the product is great. HOWEVER, I am irritated though that the product had already been used and obviously returned. I set about cleaning it as per operators manual and cleaned off grease from prior use. This was NOT advertised as “open box”. The cooking instructions have somebody’s hand written notes in it as well. I got commercial discount but fully didn’t expect I’d be getting a second hand product. Not impressed but currently in a winter storm and was relying on this product. Your quality assurance process needs to be assessed.