Me, me, me... I'm currently at the half way point. And, IMO they are the best invention ever!!! They are almost totally invisible when wearing them. And, the biggest plus is that they are removable so I can still eat what ever I want. There is no inner mouth discomforts like the metals because I simple nail file will take care of any rough edges rather than the old way of applying wax. Yes, they are a bit more expensive than traditionals. But, other than that, I can't think of any reason why anyone wouldn't use these.
My daughter, which has been wearing the metals for years to correct her bite until her wisdom teeth come through, likes mine so much that we are opting for invisaline teen for her up and coming second set.
I'd say... If you have the extra funds available,
GO FOR IT!!!