Got the battery the other day. Here are things i've noticed
build quality is 90% of what the mac OEM battery is, meaning that the "meter" button is a little "off" and the battery is a bit loose in the powerbook.
capacity is at 4182, my apple battery was @ 4400 when I got it brand new, so I don't see how these "hold" more juice.
I have correctly charged it, and it works GREAT but my previous battery sucked, so ANYTHING would have been an improvement.
I may be returning it to buy an APPLE OEM.