Kimberly,
I was dx'd three years ago, this month, with Ta CIS. I went through 24 BCG Treatments, with no re-ocurrence
The BCG got progressively harder, as it is supposed to do, and I had some unusual side effects, but all in all the big picture is still three years cancer free

BCG does work well with CIS, but there are a lot of great survivor stories just on this site with BCG working well.
As Patricia said, you would know pretty quick if it isn't working for you.
Good Luck
Nancy