Currently running Oracle of War, getting through the start of tier 3. Been going really well, players are enjoying themselves but I can't wait to finish so I can move onto running a game "in my Eberron". Not that Oracle is badly written (it's been pretty good for the most part) but the Adventurers League feel looks like a spectre that I do my best to just make exist behind the scenes.
Heh, I've been feeling the same way about my D&D campaign for a few months. Glad I'm right on the cusp of IME play now. :)
Oracle of War looks like a serious investment in prep (and cash). How easy did you find the material in terms of getting set up to play?
I ran a tier 1 mashup of Dragon of Icespire Peak and Lost Mine of Phandelver, with my own bits thrown in inspired by a video by Bob World Builder. I felt like a I had to do a lot to make something coherent that had a single through-line / arc.
As a preface: I run Oracle of War on Roll20, so that is going to factor in to my answer. There's no modules to get for it on Roll20, so I have ended up setting everything up manually. It is written for adventurers league, so for the most part NPC statblocks are from the core rulebooks. Someone also released battlemaps and the earlier ones are not that easy to line up with the Roll20 grid.
As far as session prep, that's gotten easier with time as I've absorbed more Eberron lore, but when I just started out your given bare minimum information and there are somethings the authors took liberties with. I can't speak to forming into into a more continuous story, so if you wanted to "fill in the blanks" between sessions then you'll have a little more work. I am running it AL legit, so I have to worry less about that. One adventure I'm about to run does feel VERY shoehorned in, like literally bending geography to put the party where the adventure wanted it to be and that took me a while to reconcile.
Otherwise, most of my work has been in setting up the VTT.