It is very powerful. Anybody with no knowledge at all can profit from the randomly generated flames with little additional effort, and get in minutes very nice images. But with some knowledge there is no limit to the attainable beauty.
It is very interesting that it can use multithreading to take advantage of multi-core processors.
The interface is somewhat unintuitive, there is some confusion between the names of collections of flames and flames themselves. The User Manual is no longer located at the dropbox adress that is looked-up by the software, and it is very hard to find on the Internet (most links contain infected files). Not sure if it is the same as the "Contents"