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That's really good. CW are constantly tempting for me. They don't outright say they're tuning the movements but they're at least engraving the rotor so I'd expect they test them before putting them in the case. It's something that annoys me about Seikos generally, they always seem to run inconsistently, some weeks slower than others but always noticeable.
Sumo
edscoble
The CW Colchester I have has a Sellita SW200 COSC Automatic. It keeps impecable time. To the point that I just checked and it's bang on, and I last adjusted the time when the clocks changed march 27th.