Clearly, the term "early adopter" is relative. Many buyers of the 2004 Prius called themselves "pioneers" and "early adopters" even though there were only tweaks
About fifty chapters of tweaks between the 2003 and 2004 model Prius documented in the New Car Features manual. Some chapters have dozens of tweaks and some only have a couple. I never counted the actual number but around 2,000 would be my guess.
in the drive train and a new body style
And lights, seats, motors, safety devices, and suspension, HVAC, the list goes on. I don't think there is even one part in common, other than some fasteners and maybe the horn, between the 2003 and 2004.
from the 1997 (Japan) and 2001 (USA) Prius.
I purchased a 2001 Prius for Denise and she still loves that car, so I reckon I can call myself an early adopter.