alaTest has collected and analyzed 17 user reviews of Nespresso C91 Essenza Black Manual Espresso Machine and Aeroccino Automatic Milk Frother Plus from Amazon.com. The average user rating for this product is 4.5/5, compared to an average user rating of 3.8/5 for other products in the same category on Amazon.com. Opinions about the size and durability are overall positive. The price and maintenance are also appreciated. Many are less positive about the design.