The cover fits perfectly. So good that I, however, do not trust me, the bigger 2000mAh battery from Samsung to buy, because I am afraid that this envelope would then no longer fit. For this advice I would be interested.
The Goodstyle shell is super processed, smells good and provides protection from all sides. What you should consider when an envelope with display-lid, is that you no longer the notification LED does once the cell phone lying around somewhere in a closed envelope. That bugs me a little, but that's all cases of this kind that. In this respect, absolutely no downside, only an indication for the undecided.
Your money is the shell but definitely worth it if you appreciates the Galaxy Nexus.