Nope!

http://www.bakadesuyo.com/are-magnum-condoms-really-that-much-bigger-or

I am sure it clearly reads -

"Magnums - Designed for For Men with an Inflated Sense of Self"

I hear they are real popular among ceo's and the wall street crowd

While I can't speak to the length issue, I can honestly say that as a male with larger girth that I find the magnums a better fit and feel. I've tried a lot of different condoms and I have the best physical sensations with Magnums.