We purchased the New Air AW-320ED wine cooler to hold our expanding red wine collection. We purchased this model over the AW-321ED because the wood shelves take up more room than the 320's wire shelves. I can put a 3 5/16 inch diameter on any shelf, but it is very tight because you have to lift the shelf above the bottle in order to install it. I found that the 3 5/16 inch diameter bottle fits easily on the top shelf. A Kill A Watt EZ meter showed an electrical cost of $0.22 per day over a 19 day test with our electrical cost of $0.12/KWHr. Our initial unit came to our California home in two days, but we opened the AW-320ED box only to find it contained an AW-321ED model. I called Air & Water's customer support and we had the replacement AW-320ED delivered the next day. We are pleased with the purchase and operation of our New Air AW-320ED and will probably buy another one next year.