By using it recently to level it up again after rebooting I made some thoughts about it:

Tier 1: makes you invisible on the radar when enemy is using maximum radar. Well if you're not running around with a silcencer it's pretty much useless because whenever you fire a shot you'll be visible on the enemy radar anyway.

Tier 2: removes your heat signature on nanovision. Wow, is anyone actually using this? Espcially on Xbox/PS3?

Tier 3: makes you "invisible" for the Ceph ship. Okay I see the point here but wait...I can shoot the damn thing and it won't even recognize me but why the hell am I shown on the enemys minimap for the orb. strike then?

So overall this is a module for all you sneaky stealth ninjas running around with silencers? Just wondering... so let me know your reasons for using it.