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To be honest - I love my gen 1 Boosted Board more than I do my Tesla))
Such a fun experience every time! And I really do consider it a last mile vehicle where one can park few miles away and just enjoy the ride to destination (cheaper parking or simply for fun).
It looks like the main upgrades are:
Extended range through the use of a bigger battery and swappable battery packs (up to 14 miles).
More water tolerate electronics and motors (not sure if this really means "waterproof").
Use of different Orangatang wheels (80 instead of 75)