Put them to the test and shot thousands of photo with no problem
Used these two barreries on a big Fourth of July parade and the related events without a problem. Took well over a thousand pictures.

Works as advertised, but why a new battery?
I already have several batteries for my old D100. Why do I have to buy new batteries when the two different models are essentially the same aside for some arbitrary, and largely cosmetic changes. Irksome...

The best battery for your Nikon DSLRs
After market batteries are much cheaper, but you get what you pay for. This battery is designed specifically for Nikon's line of DSLRs and that's why I bought it. My previous Nikon battery began to fail after more than 8 years of use and I expect that kind of performance from its replacemnt.

Battery life
If you are looking for the best battery for your Nikon don't think about it spend a few bucks more and buy the original one. it has the best life time than ever one, and kept charger on your bag for a longer bit. this is my second battery and splitting with the one on my camera improve my time for pictures.
Having 2 batteries avoid me to miss something really cool I could leave one charging at hotel or have both with me complete full for a long photo session.

Mixed feelings
I bought a extra battery when i bought my D90 and the MB-D80 grip. My brother has as D300 as well as some friends and they were saying me that this batteries ar extremely efficient, that a second one wasnt really needed, some squeezing between 1500 to 2000 pictures depending on several conditions.

Anyway... my D90 has 5 weeks and the most i was able to shoot with this pack was around 400 pics the most. I have been shooting in many different situations but none of them with really long exposures, i barely play back the pictures and i always shoot with the lcd screen off, i only use the viewfinder.

well, thats basically why the 4 stars only and not 5. The product is really well built, 100% quality as it should be right... Nikon!

I will continue to monitor the pack's performance and i will get back with an update. I just cant imagine how my brother can shoot more than 1000 pics with his D300 with a single charge. By the way, i shoot only RAW or jpeg but never both at the sasme time.