I believe in them when I'm sick, but I don't go taking them as an everyday thing.  Usually when I'm sick I'll start taking Vitamin B and C and I do think I feel better quicker than if I don't take these.  It makes sense that it works - because Juice and Fruit make you feel better when you are sick so it's kind of like taking a quick shot of Juice when you take a pill like that.

As for other vitamins, I wouldn't start taking anything daily unless I was advised to.  I figure I get enough of my daily values from my Mutlivitamin and from what I eat, so unless my doctor tells me I'm lacking on something I'm not going to take any other pills on a daily basis.