I have one, and I love it. The movement is modified in the 104 to remove the chronograph parts, and the reason for this is to use the constant seconds at 9 o'clock, in an automatic watch. They have also redesigned the dial side components so the calendar parts are not what you typically find in a 7750.
Good choice if you don't need the chronograph.
Personally if I was looking for an unusual implementation of the 7750, I would be looking seriously at this:
http://mih-watch.ch/
7750 with an annual calendar function...
Cheers, Al
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