Your never going to beat a G Shock for accuracy as they are the ultimate tool watch. I don't think a few seconds either way concerns Rolex or Homage wearers, its the build quality that high end pieces like to boast, and unfortunately Rolex are being caught up. Seiko surpassed them years ago with the Grand versions, if the Chinese manufacturers get anywhere near that, then the Swiss watch makers will take a big hit, they must be feeling it already to a certain degree... Apple, Casio and now the Chinese homages must have cut well into their cake!