My 2012 is still running on the original compensator unit - The only mods having been done are the "Urban Cooling" mod - how that name makes me laugh! & some bonnet latches
As for the chassis - There appear to be different levels of triangulation and bracing as the cars have progressed.
These cars will still fetch good money and you'll love it/hate it regardless of year.
I liken them to a problem child you want to give to social services but simply can't.