I got a free pair of skullcandy icon's and was very dissapointed. I have some Sennheiser PX100 which cost about £5-£10 more but they are far better.
I am a snowboarder and many snowboarders are currently sporting skullcandy and they definitely define a lifestyle but I would say if the music is more important, shop around for something else.
PS I am starting to look for DJ headphones and might see what the skullcandy GI's are like but so far reading reviews it might not be wroth my time.