Review on Blendin Flip Top To Go Lid with 24oz Tall Cup: Nutribullet Compatible 2-Pack for 600W, 900W, NB-101B, 900 Pro Series Blenders by Curtis Sherman

I had to return these for one simple reason. Although this product can technically work with Nutribullet 600, it just doesn't work properly. The 3 plastic tabs protruding from the side of the cup are used to power up the Nutribullet when inserted, slightly smaller than a real Nutribullet cup. As a result, they slip off the button easily and often, turning Nutribullet off in the middle of blending. At best you will need to mix 3 or 4 times to get a normal mix as it shuts off all the time. The worst case scenario, which has happened way too many times, is smaller plastic protrusions that after the power button slides off slide back under the power button and get stuck. I had to give up trying to get them to work and just buy the official mugs.