This isn't very good but I kind of stopped caring. Just waiting for GoG Galaxy 2.0 so I can just run whichever client invisibly in the back ground.
It just feels redundant having a vertical, text list on the side, then another grid view in the middle, and having the play button under a bunch of news / tangential stuff about the game. Ideally I'd love to just see a simple grid view where you can freely sort, hide, rename, and make folders via dragging and dropping games on top of each other. Then when you click a game it just slides in a top bar or side bar with information about it and the play button.
I'm currently using both and I can only wish Galaxy 2.0 was just as good as this is proving itself to be, frankly (bar my recent nitpickings about changes I'm not digging).
I don't have anything against GoG, but I'm not sure on what merit their new client is getting showered in praises, frankly.
Its only notable feature is the option to integrate libraries from the other clients in the list of titles... Which feels vaguely pointless and you'll still to run those clients to play those games anyway.
It's also quite taxing to run. I was just checking it minutes ago as I decided to finally integrate few other services and... Well, it was taking 10-12% of CPU power in idle, while Steam tends to stay below 1%.
Oh I've just been using the Start Menu again for years now.