Just got my mobilaire around september, after dealing with Pari's for about 3 years. I have a Pari Trek (went through 2) and a VIOS (but brand new havent used it since replacing my proneb ultra II, 3 times) I had heard about the mobilaire, but we were saving money for it, after my last pari went out, my mom bit the bullet and we found one online for about $275.
ITs louder and bigger and heavier, but thats okay with me b/c at least it freakin works. ANd the psi is adjustable (I know there is a devibuliss (spelling?) brand that also had an adjustable psi).
My TOBI takes about 12 minutes at the recommended pressure of 25 psi, instead of 30-40 minutes with the Pari's.
I have tons of compressors though now. I have my super old one, also a pulmonaide since I was a baby, and some other omron ones that I think are actually broken actually. Then a series of pari's. The mobileaire seems so much more durable.