Overall I really like this shaker as it's quite robust. I did notice that sometimes it might let go some of the liquid (probably doesn't seal all the time if you have some powder stuck on the seals). Powder shakes well but not great, sometimes leaves the lumps but I'm used to that The only disappointment is that it's not dishwasher safe and it's my own fault for not checking with the support, I'm kind of used to everything being dishwasher safe nowadays but after washing this the top metal cover has come off.

I find it much easier to clean than a typical plastic shaker, also seems to stay cold longer to which is ideal in the warm gyms. 

Looks cool. However the seal in the metal at the bottom split the first time I dropped it. I got a metal one because I thought it would be tough

Great, doesn't leak or smell after heavy use except the plastic top which can start to smell after a while.

Great for work as kept smashing bottles as they fell! Thought I would try this and within 2 uses the cap which flips open the bottle completely ripped making the bottle unusable. Very disappointed this occured, never had this happen on the other protein bottles in the past.

Metal shakers are the 1 as they don't warp or leak. Definitely wouldn't go to anything else after using them.

The seal in the lid doesn’t seem to link up with the seal on the bottle. When shaken vigorously, the shake begins to come out of the bottle.  It is a very difficult bottle to do up and leaks if laid down. 

The shaker is nice to use and has a premium feel, however after use to the product, the cap with covers the area you drink from has split deeming the shaker useless. Very disappointing having only used the shaker sparingly in the 6 months I have had it

This worked very nicely as a shaker and I liked the stainless steel construction. However after a few months the lid broke. Sometimes the plastic lid was difficult to open and eventually the force required snapped the plastic.

If you're sick of your plastic bottles STINKING then get this, it doesn't hold onto that milk/protein smell at all if you give it a good wash.  I have found though that it is tricky to clean on the inside of the lid because it has a cross section of plastic that is for mixing the powder. That is the only part that is difficult to get the smell off as it's such an awkward shape. What I did to fix this was that I switched the lid with one of my plastic shakers, it fits perfectly and is smooth on the inside. I then put the spring ball inside to mix the powder instead which has worked so much better anyway.  I'd say that my 'Frankenstein' bottle is now worthy of 5 stars and has been going strong for 6 months. An extra tip is to fill it with hot water and fairy liquid after use and let it sit overnight, then rinse it in the morning. That has saved me on the odd occasion where I've forgotten to wash it out straight away.