I love this bottle. I use it daily. It's light to carry. It keeps your water very cold for a very long time, and tasting as fresh as when you filled it, unlike plastic bottles. I love the colours (mine's a purple one, and my husband has a blue one). The only complaint I have is that it very quickly (almost instantly) gets hot on the outside if it's left in a hot car for instance, or if you're drinking from it while standing in the hot sun. This in no way affects the contents, which remain refreshingly cold, but it can make the bottle rather unpleasant to hold. However, it does also lose that heat once it's placed in a cooler environment.
Overall, I do love this bottle and highly recommend it.