Been wearing the SKX009 lately. Although its movement is technically outdated compared with recent Seiko divers, and it has been "replaced" by various Seiko 5s, the SKX really is a brilliant piece. I don't know what it is, but some sort of special sauce. For the watch person who is not a Seiko-holic, the SKX could be their one and only Seiko diver.
Every time I wear it, it makes me happy. More than holds its own amongst my other Seikos and usual Swiss suspects. I know the Internet is chock full of folks singing praises of the SKX...this is my contribution to that corpus.