I like to take one. I think some of the dosages are ridiculous. 3 pills 2-3 times a day... gimme a break.
Ive done the Walmart brand, and the centrum sports one, both lame IMO.
Now Adam, gaspari anavite, and ON optimen are all pretty sweet and will turn your pee and awesome shade of neon yellow. I only take 1 a day as opposed to 6-9 they suggest. I've heard the orange triad multi is good too. The anavite has some beta alanine in it and is probably my fave of what I listed even though it smells like roadkill.