I bought a Omega Speedmaster back in '99 and they recommended that every four years I send it into the factory for maintenance reasons. They want somewhere around $500 to open up the watch and make sure everything is working, and I just don't see the value add in it. Has anybody sent their watch in to the factor for a similar checkup?? Did you notice any significant changes in the way the watch performed...I have an automatic, so I am also wondering if the maintenance helps the second hand sweep smoother. Thanks.