These new balls are totally awesome! When I started golfing only 6 years ago, I used the Nike PD Soft series ball; that ball is fine for lower swing speeds.
However, after getting my swing speed above 90 mph (avg now is 104mph), I switched to the Nike 20XI.
These balls fly like birds of prey when they come off your clubs; straight and cutting through any wind. With wedges to the greens I've spun them back up to 12'. Even with my longer irons and hybrids I can stop these balls on the greens.
As a test, I bought a sleeve of Titlist ProV1 balls. They were good, but in my opinion, and for my game, the Nike 20XI was the winner.
I also love the feel and the sound as they come off my irons and can immediately tell by the feel and sound if I've hit it stiff.
I will absolutely NEVER play any ball but the Nike 20XI unless they come out with a better version of it.