I’m using this since last week and it works great so far. I only have one issue where some photos in my timeline are incorrectly placed at a wrong date, but this is a known issue and should be fixed soon.
I’m using Nextcloud to sync my photos and use the read-only feature of Immich which works really well. I have a cronjob to automatically sync the latest photos into Immich over night which also works quite nicely.