I just recently got this one from binsons and it doesnt work. Not very strong and im just much out of breath when im done that when i started. So deffinitely something wrong. Suppose to chane the filer but they dont send any extra ones. If we have to pay for them then you should tell us. I have severe copd and my life depends on this nebulizer. Even my back up doesnt work thats why i got this one. I use it every 4 hrs sometimes 3. So i need a reliable nebulizer. I had my other one 5 yrs no problems, i get this one to replace and it quit workinh right after 3 months. So dissapointed. Now i have to buy a new one cause no one repairs the old ones.