Are the cheap $8–$20 Amazon fans actually any good for an office desk?

Verified-purchase reviewers and r/UsbCHardware threads suggest the better-selling models (Gaiatop, Sweetfull, Koonie) are genuinely usable for a single person sitting within a couple of feet. They are not whole-room air circulators. Reviewers across the data we read consistently warn that more than a few feet away the perceived airflow drops sharply.