I use my Pari Vios - it is a dinosaur, big and sort of noisy - the third one in our household over 30+ years. I have tried smaller, quieter, more portable ones - one lasted a year before it quit, the other took too long.
I will admit that I only use my Aerobika once a day, even though I should do it more - but I cough up a lot even without it so I am not concerned.

I have nebbed as much as 6 times a day - thankfully not for a looonngg time, but when I had an exacerbation this Spring, I nebbed first duoneb then saline 4 times a day for 2 weeks, then dropped to three for another week, and finally dropped to 2 salines, and only duoneb if my chest is tight (maybe 2-3 times a week.)

Sue