I just found out today that my old pediatric doctors and the Cystic Fibrosis Foundation don't advocate the E-flow at all. I have one but do not use it anymore because it was a pain in the ass to use. You have clean it all the time and it gets clogged easy. Yes, treatments take like 1/2 the time, but I was so frustrated with the process!!
Just a warning, I know other people have complained about the E-flow on other threads.