Good: - Extremely lightweight - Powder does not get stuck anywhere as there are no corners - Design is sleek and aesthetically pleasing Bad: - The sliding lock mechanism would probably loosen over time and would result in leakage when thrown into gym bags - The liquid measurement at the side doesn't make too much sense as the bottle is opaque and you can't tell the liquid level anyway - The handle by the sliding lock probably won't be able to handle fully filled bottle's weight. It feels stiff and the plastic doesn't seem like it can hold Overall, I think the bottle is not a good choice because I am all about the leak proof caps and I do use my bottles frequently on a daily basis. This does not seem like it can withstand the pressure of time and a couple more washes. If, however, you are just looking for something to mix your powders with and to take to the gym, this would suit you just fine.

Good price considering the discounts that MyProtein often carries. The bottle is made of liquid repellant plastic, so you'll be able to drink as much of the shake as possible. The bottle doesn't have corners, so no powder will be stuck inside. Really easy to wash bottle as well.  The lid is very tight, though after a few uses it seems to be a little looser when opened. Hope it holds out well in the long run. 

After using this new shaker for a few times, i was very impressed with the quality of this product. All the different unique features of this shaker such as the round base and the secure lid really differentiates it from other shakers. Highly recommended