I'm always down for expanding on simple existing game mechanics, but not really inclined to blindly install mods just to see what they do.

+1 please provide details, stats, or other information in the mod description.

Mk1 is +20% movement speed (vs vanilla's +30%)
Mk2 is +40%
Mk3 is +60% (uses 750kW)
Mk4 is +80% (uses 1MW)
Mk5 is +100% (uses 200kW because it has a built fusion reactor)

You unlock the different mk through research. You'll need the Extended vanilla fusion reactors mod as well.

Ev: Fusion reactors is not needed to run this mod, but, if installed, I've done some tweaks and optimisations both in the recipes and tech trees.
The movement speed of the exoskeletons is balanced around the fact you can stack them in the armor grid, but expect to see a major update in the next weeks, an update that will let you cusomize the exoskeletons, and the other equipment... almost entirely.
(Yeah you'll be able to break everythin' if you think these mods are not op yet...)
_77Playmak3r