This was a concern for me, that is why i've used Synergy over VPN and it worked quite well. It also works on networks where you can't reach the other pc's that way.
I initially used synergy at work between two computers and a coworker teased me about the security implications, so I found it very little effort to pipe over an SSH tunnel
Can you share some info about that? How is it different from synergy business/enterprise where it encrypts your data? (aside from owning the encryption)
I don't know how the business edition works, but how to set up SSH tunnels is easily found on Google search, and you'd just forward the port the server listens on, and connect to localhost on the client on the same port. Very simple, and at least as secure as SSH is proven encryption.
I doubt the reason for avoiding connection is a technical barrier but rather a security one. For example, I prefer to keep my personal and work laptops completely airgapped.
