I love mine, definitely bigger and heavier than pari products, but you can adjust the psi...you can potentially use whatever psi your tubing will take with things like albuterol, but for me, at a higher pressure, the particles were probably too small to stay in my airways and I was probably not retaining much meds... For TOBI you have to be at 25 psi or under so I just keep mine at 25 psi for my xopenex, saline, pulmozyme, and TOBI.
My parents just paid outright for the nebulizer (b/c i was going through paris like you) and then we sent stuff into the insurance, which takes longer, but we got the compressor faster.
AT first i could really tell a difference with the med delivery, felt like my treatment lasted me longer, like the effects of it... then I did a week with the high pressure and started feeling crappy, so had to make up that and I got and exacerbation brewing...
anyways... the point is, I love mine even though heavier, louder, bigger... I wouldnt go back to Pari if you paid me... I have my pari trek (and brand new VIOS in waiting) which is barely used, and proably wont be used b/c even on trips if im on TOBI i am bringing my invacare b/c it takes me about 12 mintues instead of 30-40... and my fiance hardwired an inverter into his land cruiser so I can do my nice big compressor and my vest if driving for a while...
I have had mine since, I think middle of september but it doesnt look like it is going to be breaking down anytime soon. I am thinking it is going to last quite a bit longer than the paris just b/c its designed for long term, consistant use.