Actually, I would probably take the intel, although a shield is of course a good take in its own right. Too bad there's not a piece of a tech that would really help in this regard. If the mind-control ray could be used to roleblock a person, I would probably take it.
I have a suggestion. Change the Guardian to a psychic role. This solves a major problem me (and Alexhans) see with the role as it is now: the mafia cannot lie about being a guardian because the night PM's tell the person saved from the kill that they were saved. If you make the guardian a psychic role, you could change the flavor to it being something along the lines of them making a giant psychic shield around the house that stops the first killer of the night without the attackee knowing about it. I've played a lot of IRC mafia, and just having the option that the guardian is lying and is really scum that did nothing at night makes the game a lot more fun. Also, being immune to the effects of a guardian because of psychic shield would stop a shield on the scum being all upside like it is now. Immunity to the warden AND telepath? Sign me up! It also solves a few logic problems that pop-up. For instance, how can the guardian save somebody when the guardian's already been killed during the night? How can the guardian save a person from anything, yet the warlock just laughs at him? How is the guardian able to heal alien lifeforms nobody on earth has seen before?
On a completely unrelated note, I think you should add another 2-slot alien tech. I think what it should do is, once activated, makes it so all night-kills are stopped that night. Actually, I think it should roleblock EVERYBODY that night, including the alien himself. It could also be cool if you could activate it during the day to force a no-lynch. Sadly, I suck with names. I would wind up just calling it something shitty, like "The Sleep Bomb".