Invisalign Braces.... some questions

[gimmefeedback]

Has anyone here used invisalign braces?

I had braces when I was in high school, but unfortunately didn't get my wisdom teeth pulled in time, and my bottom teeth bunched up a little bit.

I'm 27 though, and a little hesitant to get any kind of 'permanent' braces.

Here are my questions-

1. Are they removable? That is, can I wear them only while I'm home and sleeping, but not in the office?

2. Can you get only a 'bottom' set, or do you always do the top & bottom?

3. How visible are they?

I'm going to the dentist this week to get some more information and a cleaning, but thought some people here might want to chime in.

Thanks!

[NT!]

googletard. stop.