Pro - it is a better look than traditional braces during the process, and the result is better than if you didn't do it at all.
Cons - Not effective I did it as I had two dracula looking teeth - which destroyed my confidence.
Having done invisalign I gained my confidence back (still not straight but at least no sticking out) However having spent AUD 7000 the result was very disappointing. The video which showed end result was impressive, however it was misleading. As the end result was way different from the result from the video image. I felt I was mislead and reaped off. When I expressed my dissatisfaction, the doctor decided to shape my teeth without consulting me. I wasn't sure what he was doing until the end of the process. This resulted in my teeth looking like they have been heavily ground and every other dentist I've seen in the past 8 yrs have made comments to that effect.