I use the word invest because the world of trains can get expensive when you account for tracks, trains, accessories, and a table. If you have children who love trains, it is 100% worth it because these sets provide hours of entertainment and engage so many learning skills. From fine motor skills of putting together tracks and moving trains along their creations to the social and emotional skills, they gain when playing in the worlds they create train sets can grow with your child and provide years of entertainment.