Bra's vs Urethane film coatings discussions are like religious or political discussions, as there are passionate opinions on the pro's and con's from both camps.
I tend to fall in the wear a removable Bra camp. I have a 996 which worn has a Speed Lingerie bra for almost 4 years with absolutely no ill effects. The paint underneath the bra is like it just rolled off of the manufacturing line, and there is no comparison between the nose of my 996 and other 996's that have a 4 year clear bra on them. The clear bras show that they have been taking bullets for 4 years, and are shall we say are a little "scuzzy".
The interesting thing about the Speed Lingerie Bra is that the cover on the front of the hood has a little lip on it which changes the airflow ever so slightly that dust and small particles tend to get lifted up and over the car. I have very few rock chips on the upper part of the hood because of this.
The bra is very easy to install and remove, both operations can be done in under 90 seconds.
The only downside that I can see for a Bra is that you don't want to have it on in the rain. Moisture trapped under the bra that is heated up by the sun has been know to cloud the water-based clear coat paint that Porsche uses. This is not an issue here in California, but would be an issue if you use your car as a daily driver. And if it is a Daily driver, it probably has its share of scratches and dings, so a clear bra would not make it look any worse.
Normally the bra stays on the car all of the time, but I do take it off about once a month to shake out any small particles that tend to accumulate on the bottom lip of the air intakes.
The bra is very stable at speed, I have had the car up to 170 with the bra on.
So I strongly recommend the Speed Lingerie Bra in the color of your car.
One last thing, this car is the PCA Zone 7 High Points Full Concours winner 2 years in a row, and the best 911 in Northern California/Nevada 3 years in a row and winner of the Palo Alto Concours in the Porsche class 2 years, etc., etc.. I credit part of those wins to the bra.