To answer your question first I'll give my personal review.
Red label is for occasional saturday night party. Black label is just a great whisky and asks nothing to its older brothers. Green label I haven't managed to taste it properly, it is too strong and makes me sweat. Gold label has a more sophisticated flavour, it is very similar to green but instead of being that hard on the stomach/throat it gives a nice warm feeling.
The blue label, well any rich boy can get one but few can enjoy it properly. I'm not jumping into the wagon until I'm ready to experience it fully.