It works great, i used it to transfer Hogwarts to the deck without issue. One thing to note, is the latest beta is causig issues with the Decky plugin manager, so i had to go back to stable after transferringOnly if you're on the beta client, it's not out on stable yet. Both Steam Deck and Steam on PC needs to be set to the beta channel.
EDIT: It's pretty seamless if both devices are already on: https://help.steampowered.com/en/faqs/view/46BD-6BA8-B012-CE43
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