I have a couple of sigg bottles but this is my fav, I have had it years. It goes to work with me every day and has seen loads of action including dropping it off the top of the scaffolding... I never clean it other than a quick shake every morning, but then it only ever has had water in it. It has had 1 replacement top and the one on it is getting quite worn so will need another top soonish. The water in it tastes as good at the end of the day as it did when I first fill it. The only problem I have is the build up of limescale just inside the bottle, but that gets a scrape every so often...
I have had a couple of the wide mouth bottles and don't think they are half as good as the sigg, I always tend to dribble when drinking out of them and you can get a plasticy taste after a while...
That picture is all you need to make the case for Sigg bottles.