I have had my Classic for some years. I decided to try this cup adapter, despite some not-so-favorable reviews, or at least not all five-star reviews that I read. Love it! It is what it is, you can't try to do more than what it is intended for, and I don't know if that was the issue with other reviewers, but I am hooked on this cup adapter, so easy to use, and to clean, no need to get out the 48- or 64-ounce container! Deserving of the five stars, in my opinion/use.