We use the Germ Guardian and love it! We use two neb cups a day (sidestream) for Bricetons Pulmozyme and two Pari neb cups for his Tobi. Once a day I soak all his nebs in warm soapy water and then let them air dry. Before bed I put them in the sanitizer and the next morning they are ready to use...and sterile!
We started using the Germ Guardian about 4 months ago after melting several neb cups in the pot.....as you know not only do you lose a neb cup but you also lose the pot, so I decided to go the Germ Guardian route. A few weeks back I was talking on the phone to Bricetons CF nurse and she had just gotten back from the CF conference in California. She said that the Germ Guardian was highly recommended at the confrence by the manufactures of Pari & Sidestream. And now that is what my son's clinic suggest and recommend for sanitizing neb cups, spacers, etc...
For us it works!