If you need to carry more water, this will do it. It definitely adds weight, especially if you use two of them. Nice to have when you are riding an area without a refill possibility. If that's not the case, stick with your standard size bottle.
Large bottle that is easy to fit in any cage. I mostly use insulated bottles so this was a bit of a disappointment. Fill is with ice and water or freeze it half full and it is warm in an hour. It's good bottle if you need the extra capacity and it's not warm weather.