Personally, I would never buy something like this, a metallic-coated figure I mean. The issue with these kinds of figures is often that the metallic paint will chip off really easily. I was already scared enough when I tried to remove Full Armor X' front helmet piece because I feared I'd scratch the gold lines of it. It's wierd though that on the official pictures, the Full Armor has yellow parts on it. On the actual figure, all that is supposed to be yellow is actually a metallic gold.
And besides, you tend to see every little fingerprint on such large metallic surfaces such as the Comic Con exclusive X.
I'm still trying to get the regular X release.
From what I can see, It doesn't chip unless you fiddle around with it for a few days. The top part of the helmet only has a
very tiny paint chip. That's why it would be best to have it on display ASAP in the proper position you want it in, and change occasionally. I've barely noticed any fingerprints either. The metallic paint is a nice deep dark blue, you won't noticed prints much at all.
The metallic paint also adds realism to it, in comparison to the regular plastic, I would say. X is made out of metal after all.
If I recall, vac-metallicizing the plastic, in which the metallic finish is layered beneath a clear plastic, will protect it from chipping. However, vac-metallicizing is pretty expensive and most manufacturers go the cheap route and just apply a metallic finish.
I'm not really a figure-collector, but wouldn't there be problems with small air bubbles in the plastic or something?