Great Insulating Mug But May Be Too Delicate For Me
594392
I had this glass for only a few days until it broke.  The circumstances under which it broke suggested that it was far too delicate to be handled as I ordinarily handle my other glasses.  If it were a bit sturdier, then I might go as far as to say that it's one of the best I've tried.  The vendor has offered to replace the item that broke, which I appreciated very much.
167858
I really love the look of this mug and I really love how cold it keeps my drinks. I gave it three stars out of five because I only used it a couple times and it kind of looks as though down on the bottom of the mug on the inside almost seems to be lifting or bubbling. I wash it by hand right away after each use it's only me that uses it so I'm not sure why that would happen maybe it's just a fluke on this particular one. I might buy more in the future and see if it happens with those, I'm not really sure I'm just still undecided right now. More time is needed to really know whether I would recommend this product or not.
1951319
I love this mug. I already had one but it cracked and the cover also broke so I had to order a new one. Be very careful with it because it does crack easily. Bought another one for myself and for the hubby.
1536899
I really liked this mug. The grip, the locking, the way the lid opens for cleaning. The only thing I don't like about this mug is the brittleness of the handle.
After getting knocked off a chair onto the carpeted floor of the library, I thought, "Oh, no big deal, the other one* used to survive four foot drops onto concrete." But to my horror, when I looked down, I saw a 10 ounce puddle of water (and some ice) slowly seeping into the carpet.
At first glance, it seemed as if the handle just separated from collar as if it were designed to do that, given how clean the two pieces broke from one another. But upon further inspection, rough bits of black plastic from the handle were still attached to the grey plastic collar, around a metal ring, embedded into the plastic (see pictures).

Why is there a metal ring embedded in the plastic; obviously it is a weak point in the handle. The metal ring reduces the contact area between the two plastics with which any force can be distributed, leading to a greater stress concentration in that location. Who Designed This!?
Maybe the metal ring was placed there to reduce any warping in the plastic due to thermal expansion/compression.

So far, my theory as to why there's a metal ring embedded in the handle is that it was used to bond the two plastics together. The black plastic handle and the grey plastic collar were molded separately. The metal ring was placed between the two, and the whole plastic handle (collar included) were passed through a magnetic induction coil, which heated up the metal ring, melting the two plastic components together, forming a very, VERY, weak bond. If they heated the ring up more and/or slowed the rate at which the plastic bond cooled, they would have a stronger/less brittle bond.

Aside from the moving parts of the handle (ie: the lever, twist lock, rubber seals, etc.) why are the handle and collar molded as two separate pieces, rather than one solid piece?

PS: Sorry for the engineering tangent.

*https://www.amazon.com/gp/product/B00CL9H21S/ref=oh_aui_search_detailpage?ie=UTF8&th=1 (served me well for 3 years)
2217047
I love this Go-cup for hot beverages. It is just the right size, it feels great, it looks great.
However, the top is very brittle. I just broke my second one, just by having it slip out of my hand from sink height to the floor after I cleaned it. It's the mechanism inside the top that breaks from the impact. It is still usable to carry hot beverages and stays sealed, but you can't click it and drink from it any more.
2271185
This mug makes great coffee, I use it almost every day.  Soon after I got it, I dropped the mug on hardwood floor and the outer wall cracked. I'm not really blaming the construction of the mug (I probably shouldn't have been so clumsy), but if you want to avoid this you might want to consider the stainless steel version. Overall I'm really happy with this product.
4449600
Just received yesterday but immediately impressed upon opening and happy with using today. Feels heavy and well made. Sleek and pretty and modern looking. Keeps my tea warm. No problems with leakage yet. So far would totally get in colors for work/home.

Update: my mug developed a crack. Amazon quickly replaced it. My new mug is holding up well.

Update: I dropped my mug and shattered it after 8 months of daily use. I have researched other travel mugs but I think I am going to purchase this one again. It just mimics a regular mug so well, something comforting to wrap your hands around!
2277708
I will say this is an excellent product in that it is insulated better than any other insulated mug I have owned.  It keeps the coffee piping hot for many hours.  I did take one star off because in order to drink you have to hold it all the way at the top in order to squeeze the button to allow you to drink, but in order to do that it hurts the wrist because of the weight of the mug when it's full.  Sometimes I have to hold it with two hands, one at the bottom so that I can drink which makes it difficult.  I wish somehow that the button could be right in the middle of the mug so that it would be balanced while you drink.
4258203
Double walled insulation is the key, but what of the material?

Blown glass is oh, so beautiful but expensive and oh, so breakable:&nbsp;<a data-hook="product-link-linked" class="a-link-normal" href="/Bodum-Pavina-22-Ounce-Double-Wall-Thermo-Iced-Tea-Glass-Set-of-2/dp/B000A5CLHA/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">Bodum Pavina 22-Ounce Double-Wall Thermo Iced-Tea Glass, Set of 2</a>.

Plastic is sturdy and inexpensive but even the best gradually scratch up and accumulate gunk in the seam area:&nbsp;<a data-hook="product-link-linked" class="a-link-normal" href="/Tervis-24-oz-Big-T-Clear-Tumbler/dp/B0002MR2WU/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">Tervis 24 oz. Big T Clear Tumbler</a>.

This leaves Yeti's kitchen-grade 18/8 stainless steel, 500.  Well, you cannot break it; I barely managed to dent it, and the O-ring secured lid stayed firmly on, preventing a spill, and they are correct about it keeping ice from melting longer.  I've been used to leaving sugar free iced tea in my insulated tumbler overnight near the bed in order to have something to drink when I wake up thirsty and melt water to take my pills with in the morning.  This doesn't work with the Yeti because I wake up to a tumbler half full of stubbornly unmelted ice!

What a nice problem to have!

Note: As you'd probably guess, the plastic lid is the weakest link in this mighty chain, but should you manage to break it or lose it, replacements are available from the manufacturer pretty cheaply.  Now, if we can only get them to offer a completely sealable lid while they're at it.

Note: Available in adult size:&nbsp;<a data-hook="product-link-linked" class="a-link-normal" href="/Yeti-Coolers-Rambler-30-Insulated-Tumbler/dp/B00JP9ALW4/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">Yeti Coolers Rambler 30 Insulated Tumbler</a>, children's size:&nbsp;<a data-hook="product-link-linked" class="a-link-normal" href="/Yeti-Coolers-Rambler-20-Insulated-Tumbler/dp/B00JP9AJC6/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">Yeti Coolers Rambler 20 Insulated Tumbler</a>, adult beverage size:&nbsp;<a data-hook="product-link-linked" class="a-link-normal" href="/Yeti-Coolers-Rambler-10-Insulated-Lowball/dp/B015AI227K/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">Yeti Coolers Rambler 10 Insulated Lowball</a>, and can koozie:&nbsp;<a data-hook="product-link-linked" class="a-link-normal" href="/Yeti-Coolers-Rambler-Colster/dp/B00SU9ACGA/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">Yeti Coolers Rambler Colster</a>.
3628384
I really loved my mug for the first few weeks, it really did keep things cold most of the day, but I just started having a leak out the bottom where the "plug" is (not sure what you'd call it). I've still been trying to use it even though a little liquid dribbles out the bottom.
1648008
I love this cup but please be aware that it is SO FRAGILE!!! I have replaced mine three times because I love it so much, but once I simply knocked it over gently while it was on the carpet and it broke. :( I swear I'm not a klutz! That said, the steeper is perfect and easy to clean and everything about it is so attractive! It's just very breakable.
3565734
My initial reason for buying this was getting a cup that wouldn't stain or scratch from coffee and stirring. Well, mission accomplished! Works just like your ceramic mugs!

The downside is if you touch the ceramic you may get burned and keep it away from curious child hands. (Which you should anyway since it could shatter if dropped.)

On the upside, I have used the low insulation to my advantage. My Keurig brews piping hot coffee and after about 5 minutes it is ready to drink. Compare that to insulated cups where you will get scalded within about 10 minutes of standing (assuming no refrigerated cream/milk.)

I like it, but don't expect hot coffee after a half hour.
3812047
Great travel mug but I only give it three stars because it isn't very insulated. It is worth the $19 though. I would buy it again.
3006447
Good mug, not insulated which I prefer because I don't want to wait too long for my coffee to cool. Cork hand protector can be removed for washing. Plus I've been trying to avoid plastic containers for food/drink so this was a good find.
2016816
Thermos Stainless King 16-Ounce Leak-Proof Travel Mug, Midnight Blue

i like it .but its face  has broke when it get me
801797
These mugs are nice and attractive.  But the glass is thin and very fragile.  I don't expect to have this mug long because it'll easily break.

I'm giving 4 stars because it is attractive and holds a lot of coffee or tea, and also because the company sent an email out of the blue saying if it breaks they will send another and would charge just their cost.  That's a nice gesture, but I probably would not take them up on it because I'd just have another fragile mug I'd be waiting to break.
2342848
I really like this big size Mug for my ice tea...but I accidentally rinsed it in hot water then I filled it with ice tea from the fridge and it cracked all the way around the bottom. Im bummed