When my car has been parked next to my buddies Spyder, the comments I have heard regarding looks have been the reverse. They have all made a point to come up to me and let me know the coupe looks better. When I had my Performante, I have to agree though, I loved driving around with the top up, and the rear glass window down, the sound was amazing.
I pretty much drive around all the time with the windows cracked to add more sound excitement in all my coupes, but a Spyder would certainly add more volume, I am not too excited to take a huge hit, just to add a little more noise, and the 88 lbs. When the used market for coupe vs. Spyder gets closer, I might consider making a change. For now, my next $100k will go towards upgrading my 2013 Italia coupe to the Speciale'.