I have been waiting for these to come back. In for 2!
My son loves chasing these and giggling at them as they "race" around. We gave them to him when he was 7 months (under supervision) It helped us to get him to crawl for objects, grasp, and he loved putting them into empty milk jugs and dumping them back out on the floor only to chase again. 1 year later we have the track set up also and he tries to catch them as they go around the track and giggles as he watches. I know these are meant for a higher age group, but under supervision the younger ones also enjoy.
For this price, they will also make great gifts.