Excellent product! We've purchased several set's over the the years and will soon upgrade to the 30 door rack. The system allows us to produce incredible finishes in very a confined space. We use them for both cabinet doors and 30/6.8 hollow core doors, you could probably go larger without any issues. The key is the ability to load material e.g cross hatch application at near package consistency netting a a high build finish in 1/3 of the time. Factor in your doing both sides at once and using the doorracks system just gets better and better.