Very positive: keep up with the specified 2600mAh (in my case) 2 of 3 batteries longer than those that are offered with up to 3100mAh, making them about as well or even better than the original battery. (The life is of course not yet been considered)
Since the third battery is replaced without difficulty and without red tape, to my disappointment has turned into joy about this battery manufacturers, the quality and customer satisfaction obviously really at heart.