Since before breakfast I have been on 10m WSPR TX (500mW). Already I have been spotted in Germany many times by Es.
UPDATE 1357z: 12 unique spots on 10m WSPR, but all were this morning. Best DX was a spot from Sweden. I assume all these were Es.
UPDATE 1456z: Several Es spots in the last 30 minutes from Germany.
UPDATE 1730z: Best 10m WSPR DX, so far at least, is OE3BUB (1229km).