I found the haptic notifications on "Medium" to be enough of an unpleasant surprise to me that I GREATLY reduced the number of things that are allowed to notify me that way.
However, either (a) my alarm didn't go off at 5:30 this morning like it was supposed to, or (b) a "Medium" vibration on my inner wrist isn't enough to wake me from even a "light" sleep.
I'm going to try it tomorrow with "High" (and a backup alarm, just in case).
Though I noticed just now when setting it to "High" that I couldn't really feel any significant difference between "High," "Medium," and "Low." I very much like the theory of the "Smart Alarm," that won't wake you out of a "deep" sleep - but if it can't wake me up, it's not as effective as the $9 clock/radio I've been using since 1982...
(Though maybe the Smart Alarm is being TRULY smart, and thought at 5:30 this morning, "He could really use another hour..."
)