spoiler kits (NOT VW)

ok... before i go further let me make it clear i am not talking VW kits.. as i already get what people think of them on here.....
am referring to other cars with spoiler kits and what people think of them and which type people like... whether they prefer the factory type kits - like on the SS commodore or XR8 falcon as examples - or aftermarket kits that are around.

yesterday on the way home i saw a commodore with a kit done by "concept to reality" or C2R and i thought it looked quite good when compared to the factory type kits.
just wondering what people think of em