I use Goosetuned and I'm very happy with it! The drive ability when not getting on it has been amazing. Mine was tuned when I bought it with 5star with a SCT tuner and its night and day difference. Shifts smooth and is ready to take off when you smash the go go peddle. Very good communication and gets revisions of your tune back when sending logs within the hour! I have the stage two package which comes with an intercooler. I have downpipes and a thermal 3in exhaust coming this week and when it comes in, I can't wait to see and feel the power added. I currently have a FenFab V1 intake, with a Borla cat back. I'll be selling the catback when I get my new exhaust. The thermal comes with new flex pipes and all.
ZFG is another solid guy and helped me trying to get my PCM flashed due to the previous owner not leaving the SCT handheld in the car when they traded it in. He uses HP tuners and they are a great tuning platform as well.