Never installed kitchen cabinets before. Tried using shims but was a real pain. Bought the EZ- Level system and it was a breeze. They install easily and quickly and leveling the cabinets was even easier. After installing the lazy Susan cabinet plus another cabinet, I had forgotten to run a wire behind them and up a wall. I removed the screws holding the cabinets slid them out ran the wires and slid them back in place...perfectly level no reason to adjust again. Definitely worth buying saved alot time and aggravation.