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It's overprices, as it's really $1-2 in materials, but you can quickly have your D90 (or D80) ready to go. I received the genuine article, which despite it's extreme cost (buying used help a lot) is worth it when you capture the right shot as opposed to reloading the tray (which takes far too long).
So it meets a 5 star need, but it's really a 1-2 star value. YMMV.
This item is a substitute for 2 of the normal, rechargeable battery packs. In other words, it won't fit in my camera where the normal, single battery pack does. It will only work with the MB-D80 multi-power battery pack. I'm disappointed that I couldn't figure this out on my own before purchasing this item. Looks like a well made item and would have received 5 stars if there was a better description/product images available.