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I use these to carry and blend Soylent, a nutritious milkshake, absolutely perfect. In all fairness, I used immersion shaker bottles to stir the mixture first, so I can't really swear that it stirs like a champion-but the bottle itself is what I need. The milkshake I drank was easy to separate, and the ball pulled it back in an instant. Today my milkshake was too cold in the refrigerator and it was frozen in a big chunk. This ball can press the frozen part back into the liquid. The top is very safe, I don't worry about it. All parts are easy to clean. I wash mine every day, but in fact I just shake the protein bottle with hot soapy water to wash them. simple. Durable and efficient. Respectful!
I use sport water bottles to mix powder (protein, creatine, any powder) and liquid. IT is very effective for this. Don't expect to mix things like peanut butter (someone asked this question). The ball is not sharp and will not handle any heavy objects, but it will mix water-soluble powders and liquids well. I did not get any worrisome powder blocks.
I don’t like the way the balls are separated-protein shake bottles do not have a lid, and something will be lost when washed and dried. It's not a big deal, but it needs to be considered. Other bottles have built-in mixing powder, but I have never used it before I know how effective it is.
Otherwise, it is well structured and tightly sealed. I didn't "abuse" the protein shaker, so I can't say how durable it is, but it doesn't make me think it is easy to break. Anyway, I will recommend this to my friends.