I have had for a couple of weeks and really like the size of the bottle. My only complaint so far is the rubber ring keeps falling out but I don't know that it is necessary for use.
I love my Taketa 18oz water bottle so much that I decided to order 3 more for stocking stuffers. Received a box 3 days later, but with someone else's 40oz bottles. Called Takeya and they answered immediately, apologized for the error and sent out my 18oz bottles, which arrived 3 days later. Easy peasy. Great product, great service.
I have had no problems with the bottle and I am pretty happy with it. My only complaint is that I can't purchase this type of bottle with just a straw lid, so I have to buy this with a spout lid and get the other lid separately.