I treated us to a Pluto Trigger, complete with a water droplet kit and spent the afternoon messing with it.
It's definitely difficult to get the timing quite right, and then there's the focus - this was taken at f40 with macro lens and there are still some bits not in focus, it's so difficult!
Tried at first with some studio lighting we had, but the flash duration was just too long and ended up replacing that with a simple Nikon speedlight. That was much better.
This is the best image I managed I think - more practice required!