When I first bought Merlin and King Leo keychains I really liked the idea. However since I used them after all this time they both look in a very poor condition. The idea of keychain for itself is cool however they made recently every minifig possiable so I decided I'm not gonna hunt them all only a few.
I have this ghost one and I like it. Infact as a kid in 1990 I use to take my Ghost minifg with me for a while cause I really liked it, so it came handy. If back then I had it as a keychain I probably would have liked it better. 14 years after the invention of the ghost minifig, he does not impress us anymore I guess, I still like him though. Basiclly I'm rating this as a minifg and not as a keychain so I guess the ghost gets in my opinion 9.5/10.
btw people right for a ghost keychain, it can light up which is great