The main drawback to GOG is a dearth of the latest games, though it does have fairly recent, popular titles like The Witcher 3: Wild Hunt. The company describes the Galaxy client as "fully optional," though you'll miss things like multiplayer, achievements and chat if you don't use it. Along with rollbacks, the new version brings download pausing, extra installation options, improved friend searching, more speed and an updated UI. It's now available to anybody in the preview program (you can enroll just by selecting the "receive preview updates" option), and will roll out to everybody else a bit later.