Wristly has shared data which demonstrates that 97% of Apple Watch customers are satisfied with the device, in comparison to 92% of original iPhone owners and 91% of those who owned an original iPad.
Wristly is a research firm intent on gathering the "unique native insights" gleaned from using an Apple Watch. The group gathers volunteers and routinely asks them questions pertaining to the device. 800 subjects took part in the group's Apple Watch satisfaction survey.
This is unofficial research, of course, but interesting none the less.