Amazon calculates a product's star ratings based on a machine learned model instead of a raw data average. The model takes into account factors including the age of a rating, whether the ratings are from verified purchasers and factors that establish reviewer trustworthiness.
The product is awesome. For beginners and even for pro chefs it is highly recommend. It's an amazing product at the best price. Easy to use, good quality, nozzles are hard enough. It is worthbuying. Great value for money.