Mine is pretty cheap as I am only having 5 appliances to straighten a couple of teeth. I have just put my first appliance in and although it is quite painful, I am really excited about what the outcome is going to be!!
I didn't use the company invisalign, but a cheaper company who does exactly the same appliances and teeth straightening course of action. I'm taking photos each week to try and capture the differences and hopefully it will be a success as these appliances were my 21st birthday present off my parents!