I flew about 6 hours with V15 this weekend. I had time to play around a bit with it. The W&B is nice. My W&B with the RV-9A is pretty straightforward, since just about any load is within CG.
I haven't set up the maintenance stuff yet, but I just did an oil change, so that will go in.
There is a new Airspace box on the main PFD page that I ended up disabling. It shows you which airspace you are in or are about to enter. Here in SoCal, the airspace is pretty busy, so I took that off the screen.
The Highway in the sky is also a bit busy, but I wasn't able to figure out how to remove that from the PFD.
I do like the extended runway centerlines. I was able to line up for straight in landings easier and to be able to pick a good runway based on the wind arrow on the screen.