I'm two months in to 6/7 months of Invisalign treatment. I think it's great. When I first got it I thought oh god what have I done. I felt like Daffy Duck and I hated the plasticky feeling in my mouth! That lasted about 5 days max. You get use to it. Nobody even knows I've got braces in
I had Invisalign and they have done a wonderful job and were really invisible. They are changed every week or two and sometimes the new brace can be a bit sore to begin with - for the first day at most, but they settle after that. They can be a bit fiddly for the first day or so too, but soon become easy.