Adding to what people have mentioned above, another thing that caught my eye are the buffers and what looks like a CRC check option.

I always wondered why Windows can't use some larger copy buffers to speed up the process, instead of writing in tiny incriments even for large files. Also, I often do a CRC check when copying mission critical files - this can do that all in one process it seems.

Although I have all these things covered in Total Commander which is my preferred file manager, there are occasions when I use Explorer and having an option in shell is nice.