I have had the NewerTech MacBook Pro battery fro about 3 months now and it is already better then the factory battery that came with the laptop. The battery was shipped with 98% life, but is has not moved from that percentage for since. With the factory battery, within 3 months it was starting to lose life.
I am now getting about a 5 hour charge out of my new battery. My old battery was at 50% life and it did not hold a charge for longer then 1 hour.
I have bought from NewerTech in the past and their price is a bit high, but it is well worth because of the support and quality of the products. A+ for NewerTech.