Unfortunately this is a false hope. A plugin or app will never be bug free. We can get it as close as possible but things will always happen that is why constant development happens so because of that I would never be able to make that promise. If you have issues after installing it, if you post here we will assist you as the previous poster stated.
I can personally say that I've been running this app for a year and I've only encountered one bug and it did not affect the rest of my site.