just finished redecorating my new room, last person who lived here put them up, and they were an absolute nightmare to get down. had to pull 12-16 hour days taking them off with a paint scraper, scrubbing the walls with white spirit & a scourer, then wiping with hot water & vinegar to get the leftover bits. horrid. if you ever see someone about to put them up, inform them of the consequences of their actions; if they persist, cut them down where they stand.