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Illegal in some states, so check first. Otherwise, it's just a matter of personal taste. I wish I could find some for my truck - I think they look good on black trucks.
I think they looked pretty good. My dad has some on his 2001 Supercrew. The ones he has just clip on and off so you can take them off at night very easily.
I have some for my black '99 F350 and they look really cool. However, I can't see anything at night. I guess if you are willing to take them off every time you drive at night then they are great. I leave mine off as I am too lazy to take them off and put them back on.