Breaks Apple’s Screen Sharing. Hard to uninstall.

Like Rreini reported, the new version for Yosemite makes itself the default VNC client, and the toggle for that in the Preferences doesn’t work.

Deleting the Screens application caused the Share Screen button in Finder to disappear, but toggling Screen Sharing off and then back on in System Preferences fixed that.

Ken R in NYC about Screens VNC - Remote Access To Your Computer