More info here: http://www.crowdfundinsider.com/2016/06/87034-republic-adds-...
I'm a bit leery of these. According to the article, "unless specifically negotiated, SAFE holders do not have any voting or information rights." I also suspect that the shareholders get taken care of before crowd safe holders in legal or bankruptcy proceedings. The rights of crowd safe holders haven't been tested in court.
I think the lack of rights and additional risk inherent in crowd safes would need to be compensated for by some kind of discount relative to what investors pay for shares. Otherwise, the risk-adjusted return is lower.
I would also be skeptical of the potential of a startup that can't convince normal VCs to fund them. If people who do this for a living don't think a startup is worth investing in, why should I?