Not greatArvosana 2/5
After about 30 times used, the flash drive said to be full, even though it was not. I emptied it (files in total after transfer was 5 GB), and it reported that 20 GB of storage was in use (even though it was completely empty). Using different computers, I finally got the flash drive reset. File transfer speed from my Mac (2013) and Macbook (2016) remained well under 10 MB/sec.
Adam