Add me to the list of those who have a tuned ST. I didn't even wait until I got some miles on it, I only have 850 miles so far and I've had it about a month. I bought them from 5 star tuning and I got 5 tunes for $230. I got a 87 street/tow, 87 performance, 91 street/tow, 91 performance, and an E50 performance.
Since my SCT X4 device is about 7-8 years old, I had to update the firmware so it will work on my 21 ST and part of the update is they have a canned tune for the ST that you can use until you get your custom tunes.
BTW, I would give 5 star 5 stars for their customer service. I ordered the tunes yesterday and about 24 hrs later I received the email from them and downloaded my new tunes. I installed the 87 perf tune already.