I've not driven a car with the Empire Kit either but I could not see spending several thousand dollars for it vs. less than Two hundred dollars for the Comfort Kit.
If this was a race car I could understand wanting to have camber / caster adjustments.
But........ for a 3 wheeled, underpowered car with a flexing / cracking chassis designed for driving down a country road on weekends.......it is overkill in my opinion.