@rundocuri- I have a relative that had nasal polyp surgery and she has been very happy with the results. She also had a lot of nasal congestion, but nothing else helped relieve it. Though she was reluctant to have surgery, she found a doctor that she trusted who had great credentials doing this type of surgery. He walked her through the whole procedure to put her mind at ease months before her surgery.
If your brother has tried all other available sinus treatments and they have failed, he should consider having nasal polyp surgery. However, for the best results, he should do his homework about surgeons in his area, and find one that has a lot of experience in this field. It is also important that he feels comfortable with the doctor he chooses to perform his surgery.