Buying a vitamix was a splurge for us, but we really wanted to invest in something that wasn't going to break every year. We decided to get the personal cup adapter because we had been using a magic bullet and liked the idea of just making a smoothie for the road. 

We live on a tight budget and really regret this choice. It leaks like crazy- the manual is very specific that when you're setting  it up you shouldn't screw it too tight or too loose. We're strong and smart people but haven't been able to find the sweet spot in the middle. I don't think our item is defective. I think it's a flawed product that can be over priced and sold by Vitamix because it is an otherwise great brand. We don't want a replacement but just wish we could return it.

Save you're money and just make your smoothies in the main attachment, it's not a big deal to clean it.