Love the idea
The concept here is great, but the change in size from the Plus Plus big to these is too much. I would suggest waiting until the child is closer to 7 to introduce these. If however, you purchase these for a 4.5yo without thinking, it will be ok. She took a few months to warm up to them, but has started to figure out how to get them attached. They were a bit small for her at first and she would play with her brother's Plus Plus Big because they were easier. These are a really neat toy and I'm only taking off one star because I think the age on these should be higher.