I would suggest to add "somewhere" a sort of speed report one can look at and evaluate if the transfer occurred with some anomaly along the way.
What speed? well, average would be fine; in the end , this datum is already available in real time (during the transfer) and the size of the file, divided by the total elapsed time would provide a useful feature for post analysis.
PS thanks for the product, it is great, easy to use and feature rich. I never had problems in using it, with Linux and BSD systems both with local and remote connections