I went with Invisalign because I was not pleased with my smile. I was told by most that I was attractive, but I still didn't feel that way. I went for it and could not be more satisfied. It's a good investment.
Pros: The trays are barely noticable, and there are also no wires that could bother the tissue within your mouth. Performing full contact activities like football or basketball can be maintain, compared to traditional braces. Your self-confidence will increase as the treatment progresses. For me, the price was actully LESS than traditional braces . . . so ask about Invisalign!
Cons: If trays are not removed when eating small amounts of food can get caught between the trays and teeth. A small amount of pain will be experienced when getting bi-monthly trays traded out. Your mouth can get dry depending on how much water you drink on a regular basis.
Keep in mind that you are MOVING teeth, so there is going to be a little pain involved. The pain goes away rather quickly. I took medication ONCE during the entire process at the very beginning. You will be proud of yourself when the treatment is over. Go for it!