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Seems to me, it has some value (again, if it's accurate) for letting people know about sleep apnea; especially as part of an overall sleep tracking dodad.

I've got enough mild asthma around me that we have a finger pulseox (or two cause we "lost" one and found it later) and I've started yelling at sick people to check it once in a while. Cause they don't usually think to, but sometimes it lingers and by the time they decide to go into an office, the numbers are pretty low.

Of course, we're not on the Apple bandwagon and stopped wearing watches once we got used to having pocket watches again.