I've been using these for about a week, and so far no leaks. I have to lay it on its side in my lunchbox, so there has been plenty of opportunity for leakage.
The shaker thingy on the rod is kinda fun, and it works just as well and the free-moving shaker ball. I haven't had any issues getting my product to blend. I do make sure to add the powder after I add some liquid, then I add more liquid after adding the powder. Powder on bottom makes it tend to get stuck to the bottom, and powder on top gets lodged in the mouthpiece. But that's a minor issue that I've had with both shaker styles.
We'll see how they hold up over time, but for now, I am very happy with them
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