The little "flat" which is not really: the battery is heavier and taller than the original.
Suddenly, the netbook is a bit surélévé back.
It can be more like a minus, but I see it as a plus because I find the keyboard tilted forward more comfortable :-)
I passed on the aesthetics, the battery is black on a white netbook, I do not care.
I possibly would attribute a fifth star if the service life of this battery gives me satisfaction (perhaps 3 or 4 years? :-))