Hi Cindy,
Perhaps someone who has used longer can make comment here , too.
I actually got the same concern like you before using NB that I would not want to tie up with it for the rest of my life.
But once I started to use , it had become my daily routine. My day would not have been fulfilled without using it. Plus the result has been so amazing that I don't have any reason why I should stop using, although now I reduce from daily use to weekly use or even less than that. But any time that is possible to top them up , I am more than happy to pump them.
I don't know if my reply makes sense to you but it is my honest answer. Maybe one day in the future that I decide to stop totally , I will come back and post here.
Kultzu
PS. Beginning of this week I was ill , and only used in once during the week, but I am still full in C70