upgrading wheels?

636sean
636sean Posts: 24
edited October 2008 in Workshop
I've had my first roadbike since april, a specialized roubaix which has ultegra wheels and im thinking about upgrading the wheels to some carbon Dura-ace 7850 which i've seen discounted on wiggle.
So can anyone tell me if i'll notice a difference?
with only ever using the ultegra wheels i have nothing else to judge them against.
Will it be money well spent or not?