Very attractive price.

As expected, it is not an original battery apple, and its finish is worse: it is less snugly into the slot, the pad is made of white plastic, not rubber, and I always try to understand how LEDs and their button.
The capacity is also lower than announced (5092mAh for me), but this is true of all Lithium batteries.
However, it fulfills its function perfectly, and has given the autonomy to my macbook 2.1 in 2007. For the price, this is a very good deal.
Seller very responsive and fast delivery via FedEx, impecable packaging.
One last thing: to assess the status of your battery, you can use the small freeware CoconutBattery mac.