I played a couple of rounds this weekend with the RED numbered 2027 prototype balls. For me, they feel a bit softer off the putter. The distance was very minimally longer (maybe 3-5 yards) off the driver and the spin seemed a bit higher than the current ProV1x. The cover also seems to be a bit more durable, 18 holes and no visual scuffs or discoloration.
To me, they seem like an incrementail improvement.
I like the ball and will play a few more rounds with them.