All software related to security should be open source. This particular piece of software doesn't sit at a crucial point in a secure system, but a greater deal of transparency would be appreciated. I personally avoid using closed-source tools for security purposes, and especially closed-source tools that are hoping to monetize. I use Linux, though, so I guess it doesn't really matter to me in this case :)
I would also say that calling home is a huge no-no for this software. I would seriously consider revisiting that choice if I were you.
I would also say that calling home is a huge no-no for this software. I would seriously consider revisiting that choice if I were you.