“An installation of the Soundtoys bundle is the first, mandatory step I take on all the platforms I use. Composing in Maschine or Live, performing live with Mainstage, or recording with Pro Tools… for every stage I rely on the incredibly useful, musical and inspiring tools Soundtoys provides. FilterFreak, EchoBoy and Decapitator are all over Hesitation Marks and used live throughout the TENSION 2013 tour.” - via [soundtoys.com](http://www.soundtoys.com/artists/trent-reznor/)more
Jody talks about his use of SoundToys plugins in [this article](http://www.musicradar.com/news/tech/jody-wisternoffs-favourite-music-software-554186/5), saying, "This is so obvious, but it’s the truth! These are evolved versions of some of my favourite old Pro Tools plugs - it’s the same company but they were under a different name [WaveMechanics]."more
"FabFilter EQs, in fact the whole FabFilter suite sounds incredible - there's not a session that doesn't have a ton of Fab Filter Pro-Q2s and Simplons on it. Soundtoys also makes great sounding plugins that can really destroy or sweeten your sound, and they're all over my productions."more
Adding in harmonics to multiple instruments. Really unique feature you cannot get with stock DAW's. Still have not used others in a production, but will soon experiment and update as soon as possible.
Whereas Voxengo helps me with my mixing, I turn to other plugins for my effects and this is where the Soundtoys bundle plays a huge part! Echoboy is the best darn Delay plugin and the effects as a whole sound fantastic! It won't cover ALL of your bases, but it will cover almost all of them alone and sound great too! definitely check it out! :D