They cost about $75 a piece and you have to clean them. Don't let anyone try
boiling it in the mico wave, they warp. You shouldn't take a nebulizer
treatment with it , because that makes them sticky inside and shortens their
wearing time.
I bet you will get lots of advice . Passy-muirs are very common. I have
heard that some people find them difficult to get used to. Everybody is
different. Good luck! :)
Cindy