This presentation I put together summarizes thoughts from Marty Cagan's book Inspired and an interview with Jeff Bonforte. It touches on subjects on user adoption based on emotional grouping.
4. "The adoption or acceptance of a new
product or innovation, according to the
demographic and psychological
characteristics of defined adopter groups"
45. People that obsess over your product
because they like the battery technology
don't buy your product for the same reasons
anyone else does...
but Irrationals do