Lovely looking bottle... until you go to drink from it.... found half my shake down my front. Kept trying to refit the lid but nothing fixed it. Think the cheap plastic ones overall worked better. 

Leaks around the lid plus mine has warped at the bottom so it wobbles and falls over. 

It was a great shaker while it lasted, however after just a few months of use the lid eventually broke off. I had a friend who also had the same shaker. The lid snapped off that after falling over

I really enjoy using this shaker. Pros: it is lightweight, smell from protein powder does not stain (obvs), no metal ball means it is quieter and less obnoxious to shake, keeps the drink cold (especially when put in the fridge for 15 mins) and my shakes are always really smooth with no lumps of powder. Cons: the lid can be a bit awkard at first but you get used to it after using for a while, it is apparently not dishwasher safe. I was unsure after reading the reviews whether to get the shaker but now I am really glad I did.

Over time the flip up cover on the lid gets harder to open. Having to force the lid open results in the flip up cover cracking and eventually breaking. This is my second metal shaker that has broken in exactly the same place.