Pro's: Not noticable, relatively painless, excellent results.
Con's: Annoying having to remove the aligners everytime you eat, A little bit of a lisp when first started.
My teeth by my two front teeth were pushed out by my wisdom teeth giving my two front teeth a larger appearance. Also, I had a crooked tooth in my bottom teeth. I was so self concious everytime I laughed or spoke... when I read about invisign I thought it was too good to be true. I wanted to fix my teeth without having the metal braces (as I am a professional in my late 20's).
I would recomend it to anyone... I have a friend who I recomended it too as well who is only one month in and is already seeing great results.