I have tried various types of shakers until now, and I must say that this is the most comfortable. The fit of the top piece is perfect because it has a plastic wrap on the inside, which makes it impossible for any water to spill. I also found that it is the better choice to a plastic shaker since the formation of mold is reduced and, in case that you might forget to wash it out after having a protein shake, the smell will go away at once after washing it with a bit of dish soap. It keeps drink cold or hot for a long time, especially in winter, I can make a tea and keep it warm for over two hours. I would definitely recommend it to everyone, it is really the best choice you'll make!

This is a very well constructed product and I use it everyday super design easy to clean 

Not happy with this shaker, hard to put top on properly and when on leaks badly round the seal.

Great shaker, mixes well, doesn't hold the 'protein stink'after it's been washed. Only thing that I found strange is the markings on the side, it's graduated for number of fluid ounces and ml's, the strange thing is it gives the corresponding number of ml's for fluid ounces instead of 100ml,200ml etc. Only something small but maybe a redesign should be considered.

Had the smart shaker from my protein previous to this and found it retained an awful smell no matter how many times I cleaned it (even in the glass wash at work) also didn’t think it mixed the powder too well at all. This shaker doesn’t smell bad after many uses and mixes up a treat :) my favourite shaker I’ve had by far! 

Now have 3 of these so take at least one everywhere with me. A great alternative for anyone looking to reduce drinking out of plastic. Mixes powder really well and doesn't leak. My favoirite aspect is that it doesnt taint so you can just wash between different flavours and there is no smell or taste residue.

Good shaker keeps the liquid cold for ages. Easy to clean, however it does leave a bad smell and needs to be washed again before use. 

Can't complain when this item came for Free, really good Shaker and keeps cool for a fair bit of time. Only down side is the twist lid, little bit fidly at times but no leaks and mixes well.

Nice design but not the most practical to screw/unscrew and leaks everywhere.

Nice feeling shaker with solid design, however it is difficult to clean the lid properly and the mixing quality is not perfect - i have had better results with the plastic myprotein shakers and would probably order a plastic one in future.