What do you think about using fake flowers?

Do you think using fake (silk) flowers will look cheap?
I am not sure what I am going to do yet but wanted some input from other brides-to-be. I love the idea of having them for ever and getting to use different colors with the cost not going up.
Update: Thank you all so much for you input I have to say it has been helpful!

As for Avis to say you are not a Real Bride if you don't use Real flowers to me is just plain stupid!
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