The Hawx Prime is a huge success because it gives average skiers (who usually don't understand how much a boot's fit can be changed) and average bootfitters (who often don't know either) a pretty good skiing option out of the box. Notice that the new Prime shell incorporates some of these design components, like the minimized chamfered surface over the toebox. In practice, most skilled bootfitters reserve the Prime for people with very high volume feet or special needs i.e. very tall insteps. They don't just put people who complain the Ultra is too short in a Prime.