It's foolish, but I still buy Advil instead of a generic brand because I like the tasty coating. I can't be the only one, right?
In the UK branded ones are often $5 where as unbranded could be as little as $0.35.
http://www.evidentlycochrane.net/caffeine-and-health-evidenc...
*Obviously you can get premium products where you get 6 or so because they are in a package with metallic pain and bright colors.