For the record it is open source which means that anyone can inspect the code. There are vetted teams integrating Edge into their applications, including Augur & Wings and a growing list of teams.
The Edge team has invited security experts to inspect their code, but you can also never be 100% certain that something is completely secure.
While open source is awesome and I trust it more than closed source for security, just because the code is able to be audited doesn't mean that someone with the skills to do so have actually audited it. How long was that OpenSSL bug around last year before it was found?
I mean, I'm still going to try this one out, but how a technical end user that is not a security expert properly vets something like this is not an easy problem!