So far no issue and it's been 1 week with 4 kids using them until our table and chairs arrive. No major stains but so far I have just used a Clorox wipe to wipe them down.  They are light weight and slide easy without scratching my wood floors. I am thinking of putting some rubber stoppers on the bottom just for piece of mind but it's not necessary. Because they are light weight is rather they be lifted and moved vs slidding them and I feel the rubber will "force" that to take place. Overall I am very pleased with these ESPECIALLY for the cost.