Persnally, I like it without the spoiler...the car is very round on the back and you ruin the look with the spoiler. Definitely a must on the previous coupe style but not on this one.
To be quite honest, spoilers are not an "in" thing like they used to. The newer cars look a lot better without a spoiler...plus you save the $$ (some $500 for the factory one on the coupe).