I bought this to make my own version of the Dunkin Donuts Coffee Coolata. There is a rubber ring that seals the top that continually comes off and wraps itself around the blades. I won't be surprised if it gets shredded one of these days. Other than that, I like the machine. Definately for 1 person. Serves my needs perfectly. Easy to clean and simple to use. Dunkin Donuts stopped getting my money the day after it arrived.