Exia has a fairly high level of articulation. He has ball joints in the ankles, double jointed knees, ball jointed hips, a swivel waist, ball jointed head, a swivel and hinge joint at the shoulders, hinge joints at the elbows and ball jointed hands. His pelvic area also has a ball joint where the legs connect.

Time to take a look at the weapons
from the side Exia looks quite sleek and swept back due to all the blades sticking out.
Exia's main weapon is it's GN sword. It can hold the sword in one of three ways: with the blade folded back to reveal a beam pistol, with the blade pointing straight forward or like a regular sword.
Exia's secondary weapons are the GN long and short blades. Although simple exia can do some quite nice poses wielding them. When not in use they can be stored on the hips. Unfortunately they are liable to fall off during posing.
Exia's final weapon is his beam sabre.This is my least favourite part of the kit. Although Exia comes with 4 beam sabre hilts we are only given one lit beam sabre, which then has to have the blade painted. I would have preferred to have four transparent blades like those which normally come with gundams. The hilts plug into the back of the shoulder and waist armour.
In conclusion gundam Exia is an amazing kit although the beam sabre issue is annoying. Highly recommended