Connecting a 2009 Macbook to a TV with video and sound output
The product you are considering retails for $69.99, Amazon is showing me one for $50 + shipping. This type of equipment is generally very sensitive to movement, easy to damage and easy to get annoyed with. Consider the manufacturing cost of that product, against how much you will pay. It seems the markup outweighs the value.

Have you considered Apple TV? You get a dedicated, more reliable, better device for $100, and it takes up less room than a MacBook combined with a cable adapter that looks like a homemade incendiary device.

Verdict: Buy an Apple TV.