As a new owner of a used X-max, I can confirm that an ordinary usb flash drive will work. It's an impressive printer, rather quiet except for the huge enclosure cooling fans (which makes it not quiet at all) and good results can be expected. It has a semi-automatic bed leveling system that works well too.

Study up on the caveats of using the printer, as if the wrong hot end is in place or the wrong build surface is being used, you'll be buying replacements too frequently. I don't think I'd pick this printer for a shared makerspace, unless mentoring and monitoring are carefully managed.