Just got it today and can't wait. Hope this helps.
Almost was going to be your Gineau Pig on the Supersprint as there is a dealer here, but last minute decided no to Supersprint due to vids from a Mini Cooper and a BMW M3 with one on and sounded a little too close to rice rocket to me. GHL sounded meaner and this is what I wanted. IMHO.
Keep us updated on how GHL sounds and if resonance is a big problem or not.