We bought three and so far each two developed mold in the lid. They are mostly the kids bottles. I think if you eat and drink, the mold will develop quickly within 24 hours. It's a hassle to clean since the gasket is smaller. It's not kid / teen friendly unless they can wash it themselves every day after school.
Me and my wife are ditching the plastic water bottles. Thus, by doing some research we have elected to try Takeya. First it keeps our good tap water delicious and cold and refreshing! We like the design with the perfect size loop handle, the way the loop stands upright and the easy spin off drink lid. The rubber bottom is a must and it has it. As well, we liked the design bringing the inner chrome container outward in forming a polished band at the large opening, provides function; as well, a classy look. Keep the colors up. Black and grey may be the trend, but more pastel colors are more pleasing and fun to some.