Right from the start, the use of CG(computer graphics), adds a sense of the fantastic to an otherwise stereotypically boring description of the solar system and space.
A journey that begins at the sun and moves to deep space links real footage with CG. I found this approach far more interesting then say "THE PLANETS", the series by the BBC. Now don't get me wrong I think "The Planets" was a benchmark series,"I saw it on the BBC and had to buy it on DVD". It would be an excellent purchase along with The Complete Cosmos.
But where "The Planets" interviews a researcher then cuts back and forth to CG or narration or real footage, "The Complete Cosmos" stays with its formula of narration with scenes created from CG + real footage fluidly. In my opinion the latter works far better. The product of which is that "The Complete Cosmos" series explains far more in far less time. Now given that the complete series runtime is 4hours+10 minutes, one gets the sense of just how complete this series is.
So if you are in any way interested in the Solar System and Deep Space buy "The Complete Cosmos" + "The Planets" to form the perfect space DVD series.