Having had the new U5 build since Saturday evening, as well as other changes for me personally the putting is a great improvement. Some of the other 'beta branch' guys have been posting pics and comments in other threads, so I'll not go over that old ground.
I'm not going in to how good it is or isn't for reading putts unaided, as my point of view is as one who uses only the BLI. The revised physics and improved graphical appearance are all a move in the right direction. Some greens you can look at and can gauge how the green slopes even without the BLI. The BLI just then adds that confirmation of where the breaks are and how severe the sloping is.
Ball roll up and down hill is much improved, with the ball gathering pace on downhill slopes unlike in U4 where it stayed at one set speed. I've found myself having to relearn the BLI to a degree, as other testers agreed, there seemed to be a little more break in the putts compared to U4. AJ confirmed this by saying there was something within U4 builds that was damping the break and roll on slopes and the move to U5 has gotten rid of this.
Add in to all this the revised putt meter, now the standard click meter as will be familiar to all clickers, the challenge of 40-50 ft putts is now ramped up, now that we have lost the 'aim to flag' on the meter. Motion swing players will also see the addition of a horizontal version of the current motion swing, which should come with both left hand and right hand options.
I'm sure there will still be plenty of poo-pooers and naye sayers even when the build comes to all the community, but for me personally the project is moving in the right direction and I hope you all get as much fun and enjoyment from it as me.
Finally, this post is not intended as a poke in the eye to the community, as some folks might see it, just because I have the build and the majority of you don't. I'm just trying to keep you folks in the loop, as reading your discussions here a lot of you are making predictions of what you will and won't see. Just trying to help the thread along and not cause any animosity.