Not long ago I decided to go QRT on 6m WSPR (no spots) and fire up 630m (472kHz) WSPR instead. So far, their are zero spots on 10m WSPR, which rather surprised me. I am still on 10m WSPR too and will remain active on 10m WSPR until after dark. After dark, I shall be exclusively on 472kHz until Sat breakfast time.
UPDATE 1500z: I see that LA3EQ (769km) has been spotted in broad daylight this afternoon on 472kHz WSPR. This is without the RX preamp. He is a few dB above the noise threshold with me. No doubt with the preamp in he would be quite a decent signal.
UPDATE 1614z: Much to my surprise K9AN (6505km) spotted me on 10m WSPR at 1536z and 1538z this afternoon. After the poor start on 10m this was not expected.
UPDATE 1734z: M0LMH (223km) has spotted my 5mW ERP on 472kHz several times in daylight this afternoon.