Bad edge work is far more common than is necessary..

Click on the picture to see this same spot after we were finished with it.

Sanding marks running across the grain are another of the very commonly found problems. Click on the picture to see this same spot after we were finished with it.

This has to be the most serious Problem. Drum marks are really hard to remove, and also leave your floors far thinner than they needed to be.

Poor repair Work. Click on the picture to see this same spot after we were finished with it.

These floors had been stained. Doesn't look like anyone bothered to clean the floors before applying the varnish.