I've been following those suits for 2 years I think.
The function I like best is the help it will someday offer to paralysed people. Why "will"?
Well because those suits today are in fact following/assisting the wearer's movements.

For paralysed people, the suit will have to totally replace the functions of the legs, which is incredibly more difficult to perform with security, accuracy and enough speed. Balance in all situations, steps, slipery surfaces, soft surfaces (snow, sand) are all difficult to manage for an autonomous system. Many prototypes are almost there. Thing is, we need 99,9999% reliability, even though non paralysed people fall too, sometimes.