I give it 5 stars purely because i have drank more smoothies in the last month than i have in the last 5 years. The convenience of this product has made all the difference in staying consistent on making them. I prepare one while getting ready to leave in the morning, crushed ice only, It cant handle cubes along with frozen fruit. I typically do a scoop of protein powder a banana and a TBSP of peanut butter with a cup of milk. I blend it at my desk about 30 minutes later. I love that I can charge it right a my desk with the USB. I shouldve gotten one of these years ago!!!