Do any fathers or educated mechanics have any insight on the Free agent Expert frame as far as rear frame flex and or Gate reaction and Manualing.. My son is looking at riding one next year and I see the geometry differs quite a bit from the Supercross Envy he rode this year, As I want him on simply, the Best.. I would appreciate any insight you may offer.. He rides 10X and weighs 75 Lbs.. Do the bikes handle and react as well ???