Except for being able to unlock those modules at lv 6? Deffinetly no idea. Maybe you need those levels for leveling up the modules (Didn't look at that yet)? Maybe it decreases the drain of energy a little?
I wonder what it is.
BTW taking a quick looking at the leaderboards, people overuse cloak and underuse armor. Seeing a dude with
2 armor 7 power and 10 cloak or something like that, I don't know how he gets a lot of kills (I almost get 1 hit in cloak all the time, I hardly use it). I'm really curious too what those levels do.