So. I splurged.
Sure, I could get the PDFs for free, but it's just not the same.
I saved about 35€ over buying locally, so I got them from the Amazon,
Dungeon Master's Guide,
and the Monster Manual.
I tried to participate in the beta test, but I couldn't get a group together because of reason, but I did peruse the playtest packages.
All in all, this is much improved. It's only less fun on a meta-level, because you could utterly wreck the old 3.x games by outscaling anything reasonable, as well as getting specific blanket immunities. However, for actual gameplay, this is much improved. I'll report more once I actually get the books from Amazon.