Personally let someone else tune your car on the platform you wish to use. You can always down the road do your own tuning. Numerous tuners have done great things on this platform.
LMS was the go to. However, they have dropped the ball on our platform over the past year.
AJPTURBO, Gearhead, Unleashed, Ortiz have taken the SCT platform and done some great things. It is all in what you want from your tune.
I have a max effort E30 tune from Brad at AJP. My car is full bolt ons, and it is pretty wild for a land yacht. However, I want it on the edge. AJP also tuned my Focus ST for Flex Fuel and it is probably the most fun car I have ever driven.
Matt at Gearhead has really spearheaded parts and upgrades. He offers the only upgraded intercooler for our platform. He also offers upgraded turbos, converter, and has a upgraded PTU in the works. Along with what I have mentioned he is the only company to offer a Auto Octane tune for our platform.
I do not have a opinion on Luis at Ortiz or Torrie from Unleashed. They both seem to be good, but I have never dealt with what they have to offer personally.
Research all tuners. Take a look at my thread I posted. I have documented everything I have done with my car including dyno numbers after each upgrade. I still need to throw my car on the dyno because I now have Downpipes and my max effort tune. I dont calculate my numbers with virtual dynos ect. I want to know what my car is doing at the tires and they usually match with the math at the track.