In January 2019 I did a review of the KiloHearts Phase Plant synthesizer.
Since then we have had a bit of a tumbleweed moment and it has all gone very quiet. The Phase Plant seems to have completely fallen off the radar. I’m not sure why that is, but it may be that it has been viewed as a sound designers tool and it’s complex appearance has put some people off. Another important point is that if you buy the complete package with all the modules it isn’t cheap. However, if you buy only the modules that you want, you get a great tool for the money.
I think it is fair to say that the whole is bigger than the sum of its parts and plugging the different modules together will give you a great sounding, flexible synth.
Mark Barkan has made me aware of a very thorough, balanced, and fair review that he has recently made of the Phase Plant. It is a long video, but helpfully he gives timesteps in the video info section so you can jump to any part that interests you.
Also see: higherhz.com