"How come most people/ pros are using metal pedals?" For Pro's it is sponsorship. They dont get sponsored to ride the cheap options. For regular people it is the bling factor IMO. I think a good composite pedal performs as good or better than a metal flat pedal. Its lights, slides over rock strikes making it less likely to catch, and transfers less energy from strikes up to the rider.
I have had a couple of nylon diety pedals and they are super hard to replace pins on. Almost makes them a throw way product. I had to move away from the brand because of the issue. These pedals look nice, but I would have to have a similar issue with them after dropping $170. Great looking pedals though
Is it worse than the Fox orange that they use on factory fork lowers? Regarding the green, it is used pretty sparingly, and doesn't look bad to me. However, I agree that the green isn't the easiest to match to a bike color