I ordered my battery from this seller, feitong2009, on September 23- and it seems forever to get here (CA) which it hasn't yet. I sent him an email that if I don't receive it this week, I will put a negative feedback and demand my money back through paypal.
I already have the other Chinese battery, 3000mAh, which works great. One charge lasts all day. And that is with regular use; surfing the net, gps, text and phone calls. So I have NO complaints with the Chinese 3000mAh battery.
Also, the back cover gives the phone a better grab. I switched back to the original back and dropped it a couple of times. With the extended battery cover it has a better grip and it does not make it look like a brick. Still looks good.
I charged them both using the wall charger- not the dock.
UPDATE: It took 31 days to get this battery for me from this seller. With this battery, so far, I have 13 hours and at 22%- without charging it.
At the same time I was waiting for this battery, I ordered from another dealer, Wanshopping from Manhattan, which arrived 5 days later. With this battery, I got 32 hours of normal use on a single charge.