SImply Great. Out of other programs for such tasks, this one is very simple at the same time very very effective.
Crashes a lot. And the editor window doesn't show up correctly - people seem to use mostly the random features so they don't bother to use the editor but I was trying to recreate a flame from the parameters of UltraFractal and couldn't do it because the editor window is all messed up.
It is a very powerfull Flame generator, but as with all fractal programs, mastering does not come easy. As an open source project, it fails somewhat, as it uses the commercial Delphi compiler, and if you try to use free version, you will be missing several commercial - for money - components, that are needed for an unmodified build. Delphi has the disadvantage that does not support 64 bit compilation, which could probably speed up the program.