I myself have never had spoon calipers. My buddie has them on his S2000 and they have great stopping power. Just make sure to keep them clean b/c if you dont the blue wears out, he had to re paint his!
Yeah i dont know if the blue calipers would make much of a difference astetically. Your wheels are already busy with blue. Performance wise I could see the benefit. Your car doesn't look bad. It's definitely different.