Well, they are better than a poke in the eye with a blunt stick.
If you already have these bases covered you likely wont change, but there is nothing really wrong with them, a bit primitive. No real harm trying them out, they won't mess up you system or anything, just a single file to manually place in your vst3 folder.
The envelope filter is fun, I'll play around with them a little more, but that will probably be it for me. YMMV