Another PUMP question...narrowed down now..just need a bit more info..

I know ...I know................
Just wondering..for those of you who have worn each pump and switched from either brand.
What did you like better or worse about each pump?
The paradigm 522 is the new one on the market...has anyone tried this and do you know what features are different from the older paradigm pump.
Any info of what you liked and disliked in regards to these specific pumps only.. that would be great!!! Any info you wish to share is good too.