I don't think I'd ever personally consider Botox, but in all it's pretty benign - it does wear off- which is lucky for the few who get complications.

When I worked at the VA I video taped one of the nurses who'd had it done (this was back in the early days, when it was pretty new to the cosmetic world, but had been in use for a while for medical treatment). She had a definite complication- her eyelid on one side was paralyzed too! It was almost comical and since she knew it would wear off she did laugh about it. She could lift it open with a finger, but as soon as she let go it would slowly drift back down. I think it took about 3 months for it to go back to normal.