I have had my vitamix for about 4 years now and use it frequently. I bought the personal adaptor cups at Costco even though I wasn't sure I would really use them. I love this accessory. I am making smoothies daily, sometimes twice a day, and I even have my husband drinking them now. I have to agree with others that the holes in the bottom attachment are somewhat of a drawback, but not enough to keep me from using it.  Thank you vitamix for adding a useful accessory to yourine of products.