I was unsure despite reading many reviews before buying, if the adapter would also support SD HC Ultra cards with Class 10. I have the adapter now in my PSP 1000 (Fat) with a "SanDisk Ultra 32GB microSDHC Class 10" in use.
Plugged, formatted in the PSP and the card works fine.
Thus, the adapter holds quasi more than it promises. From me a strong buy recommendation!