I don't know a thing about it, but a quick check of google turned up a couple of problems with it. One of them is here
Fortinet Fortigate Firewall contains a flaw that allows a remote cross site scripting attack. This flaw exists because the application does not sanitize URLs that are logged via the web interface. This could allow a user to create a specially crafted URL that would execute arbitrary code in the administrator's browser within the trust relationship between the browser and the server, leading to a loss of integrity.
I don't know if they have patched that yet, and I didn't check out the others listed. But you probably should.