Absolutely essential plugin. Adds a ton of functionality lacking in base OBS Studio for adding subtle polish and creating effects that would otherwise be awkwardly obtuse to implement, if not impossible. Should probably be included with the base OBS download.
This plugin is a real miracle. However, blur requires a powerful graphics card. In my case, just turning this effect on with the minimum power loads the card for an additional 5 percent, and each further "unit" of blurriness for an additional percent. The rest is just great. Can't wait for new features!