Last year, as an employee in a toy shop, we were inundated with returns on the 'Thunderbirds Tracey island'. Why? Well, there was nothing wrong with the Tracey Island apart from the fact that the figures (Thunderbirds 1, 2 ,3 etc) weren't included - and nowhere in the town could you purchase these essential add ons! So, as fun as I'm sure the toy should have been, my advice is to make sure you can buy add-ons before making your main purchase. This is especially true when buying games consoles or reading books that require cartridges - are the cartridges easily available, and are there a good selection.
A toy is only fun if you can play with it!