if u already got the money to get 3m or v kool..just get either 1 of it..no need to compare with air cool or other low end brand jor lor

for V kool u can tint heavy heavy at ur side and back..for front..u ask their advice..they have some selected tint film that can use ur smart tag..

for 3m..smart tag comfirm cannot pass..but quailty assure much more better then V kool..even after sales service..

not sure anything about ecotint..belum try that brand before..