Hopes I had of the new battery (of course) a significantly longer battery life.
This battery offers 1800 mAh, the original Samsung battery 1650 mAh, that's why I've decided to Mumbi.
My phone keeps now by significantly more than a day, even after intensive use (Facebook, surfing, Whatsapp, Youtube, ...) So I have the evening still almost 30% battery what I call a satisfactory level look.
I can not say anything yet, because the battery is in use only since about 2 weeks about the longevity to date.
The price-performance ratio is very good though, provided the battery does not after six months flabby!
Update 25/07/13
Am still very happy with the battery. Loading daily overnight, has been able to detect any loss of capacity (subjective impression of me)