I use the drum scan for 2 years discomobile.
Advantages: It is robust, light trs, an impressive number of rays. 6 DMX channels: the infinite configuration of the scan, I m'clate!
Inconvnients: trs is heavy (15kg), it takes a bit of smoke to give it the maximum of its capabilities.

Its original price is excessive compared to other equivalents, but yes it is unique!