Well, Armadillo will stop casual Piracy and maybe deflect the cracker noob but, as you are probably aware, nothing is crack proof.
When Grey Alien released Holiday Bonus, he uses Armadillo also, within 2 days it was available on P2P torrent sites. If you don't believe me I can send you the link. Not only that but all games released by reflexive, and all other popular sites like that, have been cracked and are readily available to download via popular Torrent sites.
So, as for Armadillo being secure, well, no it's not. The only thing that will secure your game from Piracy is if it is crap and no one wants to bother to crack it.
When Grey Alien released Holiday Bonus, he uses Armadillo also, within 2 days it was available on P2P torrent sites. If you don't believe me I can send you the link. Not only that but all games released by reflexive, and all other popular sites like that, have been cracked and are readily available to download via popular Torrent sites.
So, as for Armadillo being secure, well, no it's not. The only thing that will secure your game from Piracy is if it is crap and no one wants to bother to crack it.