The acid test is what my two-and-a-half year old grandson thinks of it. The dvd is fine and works ok, and he was initially very keen. He is very keen on lorries, trains, planes, etc, and has great enthusiasm of Thomas - watches youtube videos of Thomas the Tank Engine crashes online with great interest.
Liked the idea of the dvd at first, as I have said, but he tired of it fairly quickly and doesn't ask for it. However, that's just one opinion, from the target audience, so others may be more enthusiastic.