HOLY MOLY!!! I can not say enough about how awesome these are to replace those horrible acoustic ceiling tiles that are always water stained and gross. These change the room as well as the air by eliminating the stagnant smell that comes with ceiling tiles in an old building mind you. They are easy to cut but still very sturdy. My only issue is that  if your ceiling grid is not already even, you will for sure notice it now  once you install these!