I have used this water bottle for over a year. I started using it to help drink more water in order to loose weight. Some of the features of this bottle are particularly useful for such a project.
The lid includes a counter so you can keep track of how much water you drink throughout the day. This is a good way to help you stay mindful about your water intake. Its also been particularly useful for me because I need to try to drink a particular amount of water each day to discourage my proclivity to kidney stones. In addition to the counter, which you manually turn to record what cup you are on for the day, the side of the bottle has a measurement on it. This tells you more precisely how much you put into and drink from the bottle.
Another feature I like on this bottle is the lid. It opens with a one touch button. I used to be weary of this idea because I thought it would be easy to accidentally press the button. However, this particular model accounts for such possibilities. It comes with a metal latch which clips over the plastic lid preventing accidental spillage. I have never had an accidental spill as a result.
This bottle has endured high temperatures and less than gentle care. I left it for an extended period in my car in the heat of the Arizona summer. Despite over 100 degree temperatures, the bottle is still doing quite well. Even on a daily basis it gets fairly beaten in my bag and the bottle hasn't succumb to so much as a scratch.
Another thing I like about this bottle is the ergonomic design. Most of the time designs which are meant to fit your hand feel awkward to me, but this particular one is quite natural. Because essentially an entire side of the bottle is slightly curved, it is really quite natural to grab it correctly. This is nice when you are working out and may have sweaty palms.
Finally the loop on the top of the lid has proven useful to me as well. In the gym I typically clip my keys to the loop and therefore keep all my valuables with me. I am much less likely to forget my water bottle doing this and I can keep everything in one place. I have also used this plastic loop to connect the bottle to my purse. This is particularly useful when my purse is too full to hold a water bottle. The built in loop allows me to carry the bottle with ease while completing my business and staying hydrated.