I use this most every day, once for my husband and once for myself before we head out the door. I feel like it's a healthy decision on our part to choose green smoothies as our breakfast. I would rather not be pouring much liquid into the cup, but the travel cup does need more than the 40-oz because there's no tamper to push down. But once I figured out that more liquid reduces cavitation, I have had no issues with this. Great product. Very convenient.