Time to go to the Orthodontist

[XZeroII]

I've lived most of my life with 3 teeth that are not in the correct spot and have now decided to get something done about it (I'm 20yrs old). I'm scheduled to go to the orthodontist today for an inspection into braces but I was doing some research on the internet about alternatives and I found out about something called Invisalign. Link. Has anyone had any experiance with this, or know someone who has? I'm gonna ask this guy about them and see what he has to say, but I'd prefer to have some first (or second hand) tesimony from actual people instead of a dentist. There is an orthodontist less than a mile from me that I could go to, but I'm wondering if it's worth it. I'm looking for just a general feeling of them (how'd you like them) and price. I guess they are a bit more expensive than regular braces, but they don't say how much.

Here's a summary of what Invisalign is:
It's like a retainer that fits over your teeth and is practically invisible. You take it out when you eat, then put it back in. Once your teeth have moved a little, they give you a new one that will push your teeth a bit further. and so on until your teeth are straight.