Love this blender bottle so much, I have 3 of them! The smaller size is perfect for kids drinks too. My son loves to put some flavoured water enhancer into his water and then shake it up to blend it with the ball in it. Ease of Cleaning Add some water and a bit of soap and shake! Rinse until there are no more bubbles. I've put one of the three into the dishwasher on the top rack with no trouble. I prefer to handwash them though. Durability I've had my original one for 2 years and it still looks/feels brand new. The lid is a bit difficult to open on the smaller ones but the seal is secure and they don't leak. I make my breakfast smootie in it and then toss it in my purse and drink it on the commute into work. Design The large one works well if you're looking to make smoothies in a blender. I use the ball to keep the shakes mixed well. The small ones are perfect for protein shakes for after a workout. Even double scooping there is plenty of room and they blend really well.