The mono cyclone is very bulky in size. It is older technology compared to multi cyclone. However it is cheaper option for investment. As a cyclonic effect, inside the cyclone, heavier particles will fall down and the finer particles will enter the after filter system / go out to the atmosphere. Here the recovery efficiency is 85 to 90% Max. So you will be loosing the powder every day, every minute. But the system resistance is less compared to multi cyclone and the power consumption is less.
A typical booth with mono cyclone recovery and bag after filter system is shown below: