the changes of my sinues before and after flushing is incredible. It is like a new life. I did 14 LF's so far and I a more than happy about my wonderful free airways, the nose isn't dripping any more in the cold and the feeling of being congested is gone.
However, if you have an sinus problem in addition to flushing I would highly recommend you a neti pot and flush my nose every other day using a mild saline solution.
Keep on flushing - it will help you a lot.