I don't think there's that much difference between them. You get a little more yrdg out of them, but with the wind now, it is just like before. You have to practice, and especially now, you have to think before you grab a club and hit the ball. The meter is not any harder to hit, than the old ones.
The back nine is very tricky. I was able to get nine birdies in a round finally, but bogeyed ten. I'll still take the 64.