I have an XD-11, which is why I dropped in here. Glad I did -- just learned something. From the Rokkor Files:
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Nice looking flash. I've been using a Vivitar 283 on mine -- a real workhorse, but the 320x has a few features that the 283 lacks. Guess I'll have to go and look for one now . . . hmmm, some possibilities on
fleabay. Just what I don't need to do -- spend more money on camera gear.
As for the Yongnuo, it depends on the model. I have a YN560 IV that has only a single pin, so I'm thinking it would work correctly with older cameras -- metering the scene with its own circuitry to determine exposure. Unfortunately, I can't say for sure because mine is defective and does not work at all. With no warranty presence in the States, I'm stuck with it. (Bought it new, but it was on close-out, with no returns)
Oh, and by the way, you might be able to pick up a winder for your XD-11 for cheap like I did -- Auto Winder D, I believe it's called. Only 2fps, but at least I can keep my eye at the viewfinder when I use it.