By there own admissions the Dodo colour charged waxes are manly a marketing ploy.
Not quite true. The Dodo Factory has proved that by using several layers (3-6) you can very subtly change the shading of your car colour by using their waxes. They had a big thread about it on detailing world.
5. You can still use any colourwax on any colour car. A white car will not turn deep blue with a layer or two of Blue Velvet on it. But if you want your white car to stay purest white, don't put four coats of Orange Crush on it.
Vics is a summer wax definitely. On Red it's stunning. I shall actually be combining Red Mouse and Vics this weekend on a Red V6 TT.