i don't own one, but from what i've read, the Specter was more of a rental type marker and is not as nice as a Ghost. don't get me wrong though, Specters' are very nice guns. i know that the specter doesn't have a pump return spring like the Ghost.
this isn't much help for you. ask Dewane about it. he'll be able to tell you more.
edit... kidneythief- beat me to it.