Brilliant - the mechanics are within anyones reach with a little practice, and you'll also learn one
of the coolest (and surprisingly simple) vanishes you're likely to come across (the one seen in the
preview).
Have only been playing with this for an hour, but based on initial observations,
I think you need to do this with large coins (like the old US Silver Dollars) in order to get the
nice audible "clink" sound. Smaller coins seem less reliable for the audio aspect.
That's
probably the main thing you need to keep in mind... tradeoff between size and sound. Big coins look
better as well of course.
I highly recommend this. Practical, strong, not overly hard.