I have it !
I have this battery only for two days. But now I think this "gold 1930mAh battery is better than original. It is my subjective impress. But time of standby on battery is about 30hours and level of battery is 19% now.
usage of battery :
about 3-4 min phoning
about 2hours of playing music in ear phones
3G or EDGE was on all time - gmail
about 15 min surfing
about 5 min in facebook app
about 20 sms - all via internet ( application )
I THING - you cant do this with orig battery.
I will test phone and i will tell you my experience.
But now I can say - it was good deal for me !!!