My right engine had a .5 reading. One blade was basically heavier, but it had no static weights on it so for that engine, they had to add offsetting weights on the other side to balance it. For that, they drilled two small holes in the spinner backplate.
On the backside some small washers are stacked there until the machine reads perfectly balanced. I ran the engine up about 4 or 5 times and each time it ran smoother.
End result for the right engine was I went from .5 to .04. Definitely felt significantly smoother.
The left side measured .4 but just needed to have the static weights adjusted. They removed a big one and we went back and forth a few times adjusting different static weights until that one read .04 as well.
I'd say the props/engines are definitely smoother. I used to feel a little vibration in the yoke and that's gone now. I flew around for an hour afterwards and it's definitely noticeably smoother. Maybe not quite turbine smooth though. Worth $800? Hard to say but I think my Baron is now one of the smoothest running piston planes I've been in.