I've received messages as well. From what I've read on Done Deal and Two Adverbs they're at best unproven reps running some kind of weird representation experiment and at worst con artists. I never responded but from what I can gather it seems more the former since I don't think they've asked for money from anyone.
Not con artists. It's primarily one dude, Seth El, who seems like a nice enough guy. Whether or not he'll get your script the attention it could get with other agents/managers is another story. Check his client list which once included the dude "Zach" from that "On the lot" contest.
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