Do you think they work ?

I started to use some volume shampoo a while ago, just to try it, and I don't really know if it's working or not. Maybe a little? Or is it just my imagination which are makeing me believe that it's working. I don't really know. And then the shampoos which are supposed to like "colour" your hair, do they really work? :o The only way to get the answere is to try them out, but I've already done that and I'm still not sure about them... My parents tell me all the time that it's just bullshit, it's nearly the same shampoo but in a different tube and with higher price. Well that's not true, but I'm still confused.