FWIW, just tried it on guitar, and it's nothing that special. I'm going to keep it around for bass tho: the acutronix and bassmaster amps sound pretty good for that, and the BRT 880 (i.e., jcm800) model does a good lemmy thing.
Yeah. It's a VST/VST3/AU & AAX plug-in. You need a host, like Reaper, or similar. Many of those come free when you buy an interface. Like Ableton, for example. Cubase too, maybe.