My reaction was probably similar to a few thousand other people: well, I sure wasted $20 on the DMsGuild.
As I said elsewhere, I'm disappointed by this.
We already have Eberron. We could already run games in that world. This doesn't give us anything new. We can't tell stories we couldn't before. We don't get more races. We don't unlock another world on the DMsGuild. The DMsGuild Adepts are unlike to do any products that they haven't already released.
We're not really given any more toys to play with that we weren't already expecting, as the artificer was already supposed to go into the Wayfinder's Guide. (If they can even managed to get the artificer not to suck before the books is released.)
Okay, yeah, there could be more monsters. Wheeee. I literally have well over a thousand monsters spread over eight books, with a ninth on the way.
Oh, and the world lore. Which I already have. Because Eberron's timeline hasn't changed. That doesn't need to be updated to 5e.
It feels a little like a snub that Eberron fans get TWO full campaign setting books before before fans of any other classic setting get anything.
Meanwhile, I'm left wondering why they gave Descent into Avernus the "Baldur's Gate" surtitle, if there's no second BG book. And wondering how many more years we'll have to wait before we get to see the rest of Hell.