The SKX007 are superb for the money, and should sit in every collector's box. I bought a SKX007 in 2003. I have never serviced mine, and it runs about 15sec fast every day. Mine has the 21J 7s26 movement, I am not sure if it has been upgraded to the 23J 7s36 these days (probably not??). But after some years, my attention drifted to the vintage 150m seiko divers (6105s, 6306s and 6309s).