I received it as a gift and it is great! It is not only useful for the baby but it is eco friendly too.
I fill it up before I go out and give him drinks anywhere. Even when he is in the pram, he has learned to hold it and drink at 12 months! He has dropped it a lot before he mastered this, but the SIGG is so durable, it just has a few dents which I see it as a small token of the time he couldn't hold the cup himself.
Babies will not ask for drinks so the mum has to constantly remember to give him drinks or his solids can get real solid and hard to poo! So, I bring it everywhere and give it to him anywhere!