This is a great kit for building intuition about the function and physics of Marx generators and high voltage DC circuits. Kit worked right out of the box, produces consistent 6-7" sparks when discharged through air. Requires a 24VDC power supply, draws 2-3 amps of current.
I took my kit out of the box, connected my bench power supply, and turned it on. Easy!
My only surprise was that the kit came fully assembled. I was expecting a box of parts and some instructions. No complaints however - forming the spark gaps by hand looks like a lot of work so I'm glad it was pre-assembled.