I recommend you pick a different cocktail shaker.
352689
Only used three times and the black finish is falling off.  The lid has stuck twice and was very hard to remove.  I recommend you pick a different cocktail shaker.
4580088
The heat of the drink often make the plastic too flexible and no longer works well as a stirrer. I would recommend a thicker plastic or wood.
4537819
This was my 3rd of the hands-free stirrer. The 1st one was great and lasted a really long time. I thought the 2nd one just had a flaw as the battery top would not click into place and toppled over so I ordered another one. (I didn't do a dispute or anything like that. Things just happen. This was a different seller.) This stirrer did the same thing. That meant it toppled over into the gravy, making a mess. They must have changed the design since I got my first one. I sure am going to miss having my Stir Crazy. It's back to hand-stirring for me.
1324182
Mine broke after a few days simply from shaking my iced coffee with crushed ice--its intended use. If that's not enough, I discovered the broken piece and spring while drinking from the tumbler with the lid off and almost swallowed them! The kicker is that the replacement tumbler Amazon JUST sent me broke in the same fashion in even less time, after only two uses. Majorly flawed design/engineering/material. Perhaps Contigo should have tested its products more meticulously.
111599
If you don't mind the constant dribble of your drink down your front, then you will like this crazy thing.  I'm really irritated with it as it is a cool concept but unfinished!  The unbreakable  part is good.  However, the outer is the BPA free plastic with a glass tube (that barely manages 16oz) down the center with a rubber seal at the lip.  Now here is the trick, the lip is your fluid trap that dribbles and eventually works it's way down into the cavity (between the glass and plastic) and leaves evaporation condensation (looks like steamy crap).  You have to keep the bottle upright to prevent this.  I was hoping to keep it in the car as it is glass.  i bought it though to throw in my backpack or purse when I'm out all day - NOT A GOOD IDEA.

The screw cap is poor.  It takes 3 or 4 times before I get it and it still sometimes leaked.  It very easily threads incorrectly making it an overall pain.

I will not buy another one and wouldn't suggest it for anything more than a desktop sipper!

UPDATE 9/26/14:  Throughout the summer, I leave this in my car with ONLY distilled water (that's all that I've ever put in this bottle).  For some reason, the rubber seal in the lid has the nastiest smell now, it SERIOUSLY stinks of some kind of syrup smell.  It's weird and will not wash away.  I think it's the silicone seal.  Just FYI, take a breath and hold your nose!
1224739
There are almost too many drinks to choose from. I was looking for something that would easily give me drinks to make with maybe 10 different bar items
2000301
Given how much I loved the canister of fancy pants pickle flavored popcorn salt my husband got me from Sur La Table, I figured I'd REALLY love to have a boatload of pickle salt. A shaker for every room in the house and then some. As it turns out, this is more lime flavored than pickle flavored and I'm much less enamored with pickle lime salt than plain old pickle salt.

I rarely find a use for this, and when I do, I end up opening a new container because it stops flowing immediately after opening.

Updated: not only does it stop flowing after opening, it turns into a bizarre, pla-doh like consistency. It's oddly fascinating, but not so much that I would recommend the product.
1667665
This decanter looks much nicer online.  Actually, it looks like pressed glass. The glass looks cloudy, and the stopper falls out of the decanter.  Considering the low price, I should have known better and gave it away.
3525101
NOT recommended. after you dip this in your cup/container it changes the taste of the drink. Very over powering metallic taste.  I tried this in ceramic, steel and copper containers. Same for all.
Absolutely do not buy it.
3130340
The shakers are nice and the carry case is well constructed. However, overall I wasn't pleased with the design. The shakers are huge - bigger than standard spice bottles. They are also all the same size and have the same lids. It's great if you want to carry around steak seasoning for a whole hog but not if you want varying spices. The lids also don't work well for fine ground spices like cinnamon because the lids leak if the cans get upside down. It would also be nice if there was some elastic in the case to keep them in place. Once you take a can out the others can fall over. Also, in a spice rack at home, you see the sides of the bottles - not the tops. So it would be better if the cans were elastic bound to the top and bottom of the inside of the case - so you could see the sides of the cans.
Overall, it's a decent kit but with minor refinements it would be great.
3590091
The intent of design of this product just doesn't match its performance.  It has several failures.  It doesn't fit some soda can like Seagrams Ginger Ale & Schweppes Ginger Ale.  It breaks easily because the tolerance on the "locking portion of the tab assembly" doesn't have enough latitude to allow locking of the time.  The locking gap needs to be bigger in its circumferential acceptance of the locking tab's locking lip.
1250625
Bottom of martini glass is VERY SMALL....too narrow. Very likely to tip over and spill my wonderful vodka.  Product needs to be redesigned.
437119
It's noisy - makes a steady sound like when you pour a soda into a glass, with frequent clicks.

I would return it, but I don't want to deal with the downtime, so I guess I have to put up with the noise.
4882798
The steel shaker is the best part of this product - I found that the glass cracks very easily (if you topple it on the table it will crack) and furthermore, the rubber lip does not stay on. Overall, not satisfied with it.
2053677
I work in a restaurant and make hundreds of shakes/malts per month.  I love making milkshakes and was really looking forward to having my own machine at home.  As soon as this machine arrived i begun to make a shake immediately.  However, this thing broke literally less than half way during the first malt.  A simple vanilla malt!  The only things that aren't made of cheap plastic are the rod and the cup, and even the prong on the rod is made of plastic, which also started chipping about 30 seconds into making my first shake. Even the piece that holds and spins the rod is made of plastic which is what broke actually.

This machine can mix milk and water and just about that.
Definitely wouldn't recommend to anyone, which is why I'm sitting here writing this.
1212471
When I received this item I was disappointed.  The rack is okay but the shakers are not of very good quality.  The glass is extremely thin.  I was quite surprised.  I bought a similar set of shakers in a grocery store and the glass was much thicker and the shakers were of higher quality -- and that's a $4.00 set in a grocery store!  The set is not bad enough to go to the trouble of returning, but I WOULD NOT RECOMMEND to a friend at this PRICE!
1828428
I got this as a gift for my boyfriend but he says they change the taste of the whiskey so he doesn't use them.