The Floor Plan's walls are easy to plop down and use with one very frequent and problematic exception.
When you have a wall that is the wrong length dragging the ends of the wall doesn't allow you the accuracy required. I needed a wall exactly 53 feet long. Even when zoomed in the wall goes shorter (52' 6") or longer but won't land on the desired length.
Further I have to zoom in and out over and over to see what the actual size is when I let go of the wall end. So I have to "blind drag" the wall scroll/zoom look to see if it's right reposition zoom/scroll to try again... ONLY to eventually discover the tool won't let me land on my desired dimensions at all!