PB1 are stand alone shades. If u wash them once a week. Thats all you really need to do. PB2 have few rubber parts. And have to be baby sit a smich more. But for me PB2 fit is more comfy. Got both PB1/2 in my daily wear. Love em.
thanks for your comment brow, I already washed them 2 times... but I need to buy the stainless or titanium hexalobular bolts for them, because the ones which come from fabric are aluminum COMPOUND and DO rust with time and water exposure. It is the only complaint about these beauties. And only wash with neutral soap, as said on their manual.