As has been said axanthic is a base morph, like albino. With nothing else added in it's not spectacular, but when it meets other morphs,like spider,pastel and pewter this year I see the results can be awesome.

All axanthic means is lacking yellow pigment, so it is a normal ball, sans the yellow, just as an albino is 'just a normal' without one form of melanin or another present. This is where leucism differs, most forms of leucism lack all pigment but retain eye colour (unlike albinos). Piebald is a form of partial Leucism. This applies to everything, be it ball pythons, horses or birds.

They look best as youngsters but tend to 'brown out' a little (or a lot in some cases) with age. Like any ball python morph the quality can differ from snake to snake. A good axanthic can look great, but when it's met (for example) the pastel gene a couple of times it looks amazing