As a product it doesn't have any issues. I've ordered this set of bottles for the second time. They are really good. We've been using these bottles for more than a year and they are excellent. They don't get black inspite of using the borewell water. Maintenance is easy and the design is pretty good. My experience with other Copper bottles was that they become black over a period of time and the cap to close the bottle will be either tight or it leaks. Go for it. My Only bad experience this time is the delivery. I wanted to send these bottles to my daughter (who is living in another country) and at the time of the order it was stated that by Friday (Dec 8th) before 8PM the bottles will be delivered. I confidently ordered because I never had a bad experience with Amazon delivery w.r.t to schedule. They have always been prompt with delivery schedule. But this one time, the product was NOT delivered on time. Instead of before 8PM on Friday, it was delivered at 10PM. The delivery boy has given all excuses for the delayed delivery but the the intent of sending the bottles to my daughter didn't get full-filled.
Reviewed in India on 11 December 2017