I am currently gaming the GT1 and I was using a Ventus Blue Velo+ 7x in mine tipped 1". I was getting around 250 carry with minimal roll out at all, the ball went super high and just dropped.
I put in the Ventus Black Velo+ 7x (tipped 1") and it definitely brought the height down quite a bit, I seemed to get a bit more roll out with it.
I feel comfortable using either or, the course I play at mainly gets hit with quite a bit of wind so on those windy days Ill probably plug in the Black, otherwise I will probably use the Blue. I use the GT1 in a 3W (250-260 yd) and 7W (225-235 yd) and absolute game changers to attack Par 5s.
I contemplated long and hard about getting the GT1 Tour, but honestly, I don't think I need anymore distance or the potential benefit of what it could bring, my gapping is perfect how I want it at the moment.