But Synergy is now commercial, with a stupid surcharge for TLS, so would it make more sense to say "the only reason to use synergy is if you're using an old OS and don't have hi-DPI screens"?
Gotcha, thanks. I used to use Synergy 1.x, and it was great. Recently returned to the fray and didn't have time to build-from-source (or didn't find an easy 1.x installer for new OS X) so grumble-grumbled and paid for Synergy 2. and expensed it.