I hope none of you are taking this review too seriously
Where did I leave my keys? Just turn out the lights, and there is your smiling little ghost showing their location. Unfortunately, this requires it to be night, but at least you can find them half the time.
On the other hand, the glow function only works after the ghost has been exposed to light, the more intense, the better. And the place you are most likely to keep your ghost keychain? In your dark pocket. If you do happen to have it charged up and take it out for a spin in your car at night, there it is gyrating wildly and distracting you from the business at hand.
So, the glow function is a hit or miss affair. However, there is one reason why I'd recommend the Ghost as an extremely suitable keychain over most other figures:
If you actually use you keychain as such, it means it is being assaulted by loose chain, the acttual keys, odd ticket stub, piece of candy that was come unwrapped in your pocket, etc. Keychain figs take a terrible amount of abuse, and suffer for it. Hands crack and fall out, individual legs fall off, and any printing gets worn away. With the Ghost, there is no printing and the legs are protected, and thus is very survivable - my current Stormtrooper is white as a....well, ghost!
And, of course, you can always practice minifig neurosurgery and extract the keychain post and have a ghost that shows its cause of creation!