I found when I threw the d1 like a full power max distance drive it was a little more understable than I would have thought. If i threw it too low it would hold an anny until it eventually ran into the ground.
I got a chance to throw the D1 a few times this weekend also and the above statement is exactly what I saw. I throw primarily forehand off the tee and use 170g star destroyers for distance( 375' - Adv Master). With about a 10mph headwind the D1s held the forehand Anny line and never fought back out of it. The destroyers (relatively new condition and a little lighter 171g to the D1s 174) held a similar line early in the flight but eventually flexed back which is what I expected from the D1. I have a lighter (170g) D1 on the way and want to compare them in the same conditions. Not really sure my thoughts yet - More throws needed to form a good opinion. One a separate note DDs Trespass has impressed me early on throwing similar lines.