Just tested between Mac and Windows,... mixed impressions. Login via Browser, no configuration necessary - or possible! Just the Position of the screens can be changed. Worked over wifi and institut firewall - OK. Copy&Paste works. File-Drag&Drop never worked for me really, so with 2.0 not at all. Closing the MacBook with Monitor attached - Synergy doesn't accept mouse clicks anymore - but mouse pointer still worked. Opening the Lid, didn't helped. It runs 100% in the background, not even an icon on the taskbar/... so you can not do anything. By trying to kill it, i found out, it's immortal. 3 processes, but even if you kill all 3, there is still something left which opens every 3. Restarting the App in MacOs doesn't bring up the application anymore. Logout/Login and Mouseclicks are working again. Window still not showing up - but hey, it works in the background. Nice feature: there are no servers/clients anymore. Both directions are possible.
Just seen: Many features are NOT included in version 2.0, but will come in 2.1. Like FileSharing, TaskbarIcon, ...