The key of the intercooler is where you live and what you do with the car. Most people see the dyno results where the car is sitting still with a fan in front of it and go "wow, that intercooler gets hot" which is true. I don't drive my car on a dyno, I drive it on the street, in a cooler climate, with only 3 months in which the temps are reasonably warm. Autocrossing was where I really expected to see the need for the intercooler, but with spraying the intercooler down with ice water between runs with a spray bottle, max temp was around 10 degrees above ambient. Most of that was from the idle time getting to the starting line. If I lived in a warmer part of the country, drove the car hard, did canyon runs, autocrossed it on a regular biases, open tracked the car, and was looking for further modifications, then the intercooler is 100% needed. The other thing to remember is that many modifications come from faulty information proliferated online and accepted as fact. The RMM is a perfect example. Everyone thinks the engine hits the firewall with the stock RMM and they need to upgrade it right away. The truth is that the Focus ST had an issue with the engine bumping the AC lines on the firewall on early production units. The Fiesta motor is very far away from the firewall and there is no way for the RMM bushings to deflect the inches it would take to cause an impact. Aftermarket companies love this since it sells product based on poor data. The best thing to do is research the products yourself, collect data that either supports or doesn't support the modification, and then go from there.
As for the color, there is a 2016 ST in town that is Kona Blue, and it does look really good. I still love my Performance Blue, but no hate at all to Kona.