Long term and very happy Displayfusion user, just reporting a minor quirk; on windows 10, with Displayfusion Pro 7.3.4, VLC's toolbar button will always display on the primary monitor, even when the program's window has been moved to a different monitor.

It's possible there's some setting somewhere I've neglected to turn on, but a little hunting on my part turned up nothing. I assume that this is a windows 10 specific issue, since I don't recall running into it in the past - then, it's been awhile since I last used VLC!