Carbon spoiler (RW): poll & Questions

Hi everybody,

I am totally in loved with my new white m235xi. I have the black M perf Exhaust/diffuser/rocker panel like here http://ift.tt/1dGZhPn

with the same OEM wheels

I have ordered the RW carbon rear spoiler and mirror caps.

While I am absolutely sure to install the mirror caps I still have a doubt about the spoiler.

What do you think : Better with or without?

IF I install it and on t like it , is it possible to put back the former trunk spoiler?

Some opinion on the RW which claimed to be the exact replica of the M?

Thank you