It has disappointed, actually, according to the very article we are commenting on: "The company sold about 10 million units in the first year, a quarter of what Apple forecast"
You definitely can see it on more people's wrists than in the early days.
And the "Wearables, Home, and Accessories" revenue was 5.1 billion last quarter, which is bigger than iPad Revenue of 4.8 billion.
I actually think that Watch sales is a surprise on how well it is. Nobody expected it would be that good.
My point is, peripherals can be successful and game-changing.
The day watch becomes standalone and/or compatible with Android is the day it has a chance of becoming a true game changer. Until then I wouldn't even describe it as a peripheral, but just an accessory for an iPhone really.
https://en.wikipedia.org/wiki/IPod#/media/File:Ipod_sales_pe...