Of all the “glitchy” effects this is my favourite. It is both fun to play with and useful. The GUI is excellent- built in help and clear delineation and arrangement of sections as well as good colours.
The presets are good, but you really need to work on them yourself. Just play. Nothing really subtle ever happens, although I find that the bottom left-hand corner of the rectangle gives the most useful effects. (And try tempo sync on the LFOs). Listen to the mp3 demos first to see if you like the idea, but they really only scratch the surface of what is possible.
It should probably be called something else , although I have no idea how you would describe it adequately. (One of the DestroyFX people describes it as “… nothing more than repeating parts of recent audio … and applying some cross-fade in some cases. … though what makes it interesting is the ways that you can control how that happens”).
Stable, always works, but can be hard on the ears.
Not sure what support you’d ever need and although it is free I expect you’ll find yourself donating something.
VitaminD’s review (below) really says it better than I can, but I’d encourage its use on any kind of material.