It's a really nice virtual modular. The UI is very well thought out. I ended up buying quite a few of the other modules. Then I built a real Eurorack modular after getting way into it.
Its main competition now is VCV Rack, which is also free, offers a bewilderingly huge number of free modules from 3rd party developers (of many quality levels -- some are really great, some are someone's first attempt at programming -- no offense), as well as some paid ones, but which, for now, doesn't run as a plugin (it is standalone). When VCV Rack comes out in plugin format, that version won't be free (I think it'll be around $100).
The advantage of Cherry Audio's Voltage Modular is that the manufacturer tests and somewhat curates the 3rd party plugins as well, so everything works and follows consistent UI conventions and guidelines. The disadvantage is that you have to pay for most additional modules, and the selection, while worlds better than any real analog studio I've ever worked in (and I've worked in very large analog modular studios), still isn't as great as VCV Rack.
I'd say that among composers who use real (physical) modular analog synthesizers, VCV Rack is more widely accepted and integrated -- you can integrate hardware and software modules using either software package, but VCV Rack is currently ahead in that realm.