These are sturdy tracks and add more variety to the sets we already have. They are fun additions. As long as your trains/cars aren't too tall, they actually will ride under the tunnels created by these parts. The biggest difficulty is making sure the blocks are positioned well enough to hold everything up. It's not too difficult, but can be for some kids depending on their age/ability. I think it would be REALLY cool to see some curved pieces like these, but I suppose that's part of another set somewhere.
Rating: [5 of 5 Stars!]