How do you rate something with an effective life of 3-5 years? I'm not sure, but judging from the fact that my original Apple battery died outside the warranty period and this battery does what it's supposed to do for a reasonable price, I've decided to rate it 4 stars. If it lasts as long as it is supposed to, it will have been a great purchase.
Works better than the battery which came with the laptop. Will buy from this seller again.
More expensive than some, but a good value. I bought a cheapie before this and ended up throwing it away - this model worked perfectly, takes and holds a good charge.

