I pined for this as a 10yr old and saved all my pennies until I had enough to buy it.
I was disappointed in the performance (Remember now, I was a kid) It needed constant adjustment as the cylinders are small and run out fast and it literally eats oxygen cylinders like their going out of style.
Adult me would likely have better results, but you're still limited to the capacity of the oxy cylinder.
They did at one point offer a system that utilized two oxy cylinders and one fuel cylinder, but I think the whole concept died out shortly thereafter.
Still neat and useful in the right hands.