How do you measure the success—or failure—of the Apple Watch?

That was one of the questions posed early on Thursday at Glance, a day-long conference in San Francisco devoted to Apple’s AAPL first wearable device.

Some benchmarks from my morning notes:

  • 80% — Apple’s current share of the smartwatch market
  • 21 million —Projected first year sales (estimate by Asymco’s Horace Dediu)
  • 100 million —Projected sales by 2017 (estimate by Creative Strategies’ Ben Bajarin)
  • 30% —Percentage of Apple Watch buyers who weren’t previously wearing anything on their wrist
  • 6.9 seconds —Average Apple Watch interaction (versus 38 seconds on the iPhone)
  • 85% —Percentage of Apple Watch owners who say the device has contributed to their health
  • 27% —Percentage of Apple Watch owners who say they’ve lost weight
  • 82% —Percentage of early adopters who say they have given an Apple Watch as a gift
  • 46% —Percentage of Apple Watch owners who have used their nose as an input device


Disclosure: I was a participant in one of Thursday’s panels.

Follow Philip Elmer-DeWitt on Twitter at @philiped. Read his Apple coverage at or subscribe via his RSS feed.

Be sure to sign up for Data Sheet, Fortune’s daily newsletter about the business of technology.

For more on Apple, check out the following Fortune video: