I hit it a couple of weeks ago and have one on order.
It hit the first two generations of PXG drivers, but neither were good enough to buy. This one was different.
I struggle with too much spin and this one was good for me. I currently have a Sim Max and the Proto was getting 5-10 additional yards of carry and lower spin. I also found it to be pretty forgiving.
Looking forward to getting it In hand.