I just started treatment with my first tray and have had it in for two weeks now. The first few days there was pressure, no pain. It felt foreign and felt like my teeth couldn't breathe. I have gotten used to the feeling with the aligners in and sometimes i forget i have anything on my teeth now.
When i remove the aligners to eat, i can definately tell my teeth are a little sore when eating tougher foods so i'm assuming that means they are starting to move.I don't have any of those "buttons" and my aligners have stayed put so far.
My Orthodontist said with my next set of aligners they'll be doing some of the interproximal reduction (aka filing). I'm a bit nervous as i usually have sensative teeth and i'm afraid this will make them worse. I have to say that i've been fairly happy with them and have smiled much more knowing that my co-workers can't see them, and that i don't have a mouth full of metal cutting up my cheeks.
I see some people haven't had good experiences here which completely sucks. I felt that going to an Orthodontist would be better as they specialize in alignment corrections rather than dentists who may not be as qualified and may recommend patients that otherwise wouldn't be good candidates for invisalign.