Be warned that the logs are made from fiberglass, so use gloves when handling them.  The white rocks are covered in (white) dust, so if you intend to use them, rinse them first to prevent the dust from getting everywhere.  If you are installing this on your own, know that it is heavy enough to make getting it on the mounting hooks and top screw slots a sweaty ordeal.  Find a friend to help out :)  If I remember correctly, the directions indicate to put the frame on before you attach it to the mount, but don't do it; the frame should be the very last step.
If you're not using it as an insert and you're not getting an electrician to add a recessed plug and and shorten the existing cord, you'll likely want a cord cover as the look of the cord can ruin the whole look.