Cheap
7 year battery (although my experience is that the plastic strap fails first - they were so cheap that I just bought a new watch.)
Manual says +/- 30 seconds a month (years ago was 15s however the ones I have had have been better than spec over the months.)
Water resistant
Disadvantages-
Price seems to have gone up a bit over the years.
A more modern problem might be -
Apparently recommended by al-Qaeda - I was there first.
Leaked files reportedly reveal a certain Casio watch was viewed with suspicion by US officials as a possible sign of terrorist links.
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Perhaps best not worn for passage into or out of USA?