So far I'm happy. I'm finding it a bit crampy (other than normal menstrual cramps) after insertion. Sort of a mild kicked in the crotch feeling. However, it isn't so bad that I can't live with it. It's not as painful as tampons can be if inserted wrong, and it's much better than the chafing I get from pads!
My only concern is any actual damage it might be causing. From the posts I haven't gathered that there's any risk of that.