Love the looks and durability of these tiles. They allow for air to circulate in our basement. These are gorgeous as is, but we will be putting some other tiles on top of these, leaving the gray ones exposed. We purchased the blue because they were the least expensive and cover most of our basement floor. This is just one room that has not been completed yet, but I love the overall look of these tiles. Gray tiles are a little easier to connect just with your hands than the blue ones. Blue ones need a rubber mallet, but they have been going down very quickly.