Instruct: Classify a given review into positive or negative sentiment.
Query: Great, but not perfect.

This is a great addon for a D90, but I have to give it 4 stars for the following reason:The shutter release button is in no way similar to the one on the D90 body (and I assume the D80 body too). There's no "clicking" feel between the half press and full press. That's the only downfall, but it's kind of an important thing for the price.Other than that, it adds a proper weight and balance to the camera body. And I can shoot for weeks on end before needing to charge the batteries. (Only use genuine Nikon batteries!!)It makes the camera look pretty intimidating too (re: cool)!Knowing all this, I'd say it's worth the purchase. I'd buy it again, and I'd also buy an updated version if they fixed the shutter button.