Hi, In answer to your question, I'm guessing not all CFers use TOBI. I used to & I can say that it did wonderfully with me. My lung function slightly improved after being on the TOBI. However, I'm not sure why, but after a couple of years, I noticed a shortness of breath (SOB) about half way into a cycle of TOBI and it was almost oppresive, so I discontinued use. It could be that I have a secondary infection going on too. I'm starting IVs today, so maybe I'll get brave after IVs are done & try TOBI again to see if I can tolerate it better.Other than a raspy voice initially, I don't remember any other side effects (other than being SOB, of course).I hope it goes well with you if you decide to start it.<img src="i/expressions/face-icon-small-smile.gif" border="0">