The machines are specifically designed to not need the full permitting process. I had an extended conversation with the head of legal for Sparktacular at LDI and if you have any questions about permit issues I'm sure they will help you figure out your paperwork if you call them, so I wouldn't be too worried about that.
As for the units themselves it's important to realize that they are shooting out small pieces of metal (think a bit larger than grinding dust in the weld shop). These will accumulate on the floor and need to be dealt with. They can be add a little bit of slipperiness to the floor (although very manageable for most performers) and you wouldn't want anyone underneath them while they're going off. The metal bits would get ground into the floor if there's a lot of traffic and would be hard to clean.
For the large show I was going to spec these on we went to a large FX shop in Vegas for a demo and they told me they had 20 units less than a year old and not a single one worked well enough for a demo that day. Sparktacular assured me these had to be fakes as the real things are much more reliable. The customer basically went ¯\_(ツ)_/¯ and we moved on. So I guess get a demo before you purchase or have spares in the rental package.
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