Moving a 21GB movie to my laptop took about 30 seconds, and sending an 85GB game took roughly two minutes to complete. Transferring my 4K photos took no time; it was instantaneous.
It also seems heat increases transfer times. Moving the large game file to my Asus ROG Ally took nearly 15 minutes after the handheld began overheating. On the back of the Satechi Enclosure is a cooling fan that automatically activates when temperatures rise.
I had hoped that the fan, along with a cooled-down ROG Ally, would improve transfer times for the 85-gig game, but it didn’t. The process still took 15 minutes to complete during the second time. So If you have large files to move, be aware that transferring may take longer than expected. From what I can tell, your experience will vary from product to product.
Satechi’s website also provides a detailed list of supported hardware and operating systems. A company representative told me that the device works with certain Android phones and that they would update the listing to include those models. However, that information is still missing at the time of this writing.