The bottle is expensive that's true, nevertheless the rubber sleeve is priceless. I've hit the wall with the bottle by accident and it didn't break because of the sleeve. Since it's glass, the water flavour is perfect. But, I have to say I'm very disappointed with one thing: I use this bottle to drink while I'm at work, after a few sips of water, the bottle's "mouth / hole" starts smelling very bad. A mouldy smell! I guess it's because of my saliva being in contact with the rubber from the bottle cap. It has to exist a better rubber for this! I have to clean constantly the bottle's "hole / mouth" because of this, which is annoying.