I went down that rabbit hole and really had no options that were satisfactory. I average almost a book every 10 days so it needs to just work. I got a kobo libra and love it. Supports all my formats and i sync over wifi with calibre-web
What I wish would come back is really good COOP PVE. I ran a hugely popular ut2004 Invasion server that we wrote a custom mutator for (Sudvasion). I had a T1 line to my house that just ran the servers. We had a solid dedicated group of people from all over the world playing that 24/7. Was the pinnacle of gaming for me. 18 years later I still chat with some of the community via steam disc etc.
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I aquire 50/50. I do buy from thier store and use calibre and calibreweb for the other "store" calibre web has pretty good support but you do have to do a very easy config update to sync over wifi. But i basically add to a shelf in calibre web and that syncs to the reader. it just works