Installed the kcm kit on my Voron 2.4 and it works great! Still have some tuning to do and macro adjustment to fit my need but i will be buying a second kit for my eligoo neptune as soon as i can. I will review that also

I’m having an issue not sure what I’ve done wrong
Chroma pad talking to printer with KLIPPY but Chromahead is not playing ball

I have a modified Ender 5 Plus that runs Klipper so for me the best solution was to order the KCM set. Shipping time took just at a month from order to delivery here in the US.

The good:
The hardware and kit are top notch. The included kit seems high quality. The Chromahead appears to be well built as do the accessories that attach to it. Everything was pretty much included to get the set up and running.

The bad/mediocre:
The instructions are extremely lacking. The instructions will kind of get you going but there's a lot of interpretation and a bit of guessing. For example, the instructions for the kit show the kit comes with the sheet metal parts to mount the chromahead and the CX extruders. However, that is not the case, you'll need to go and download the STL files and print them. While not a big deal, it would have been nice to either see the instructions changed or otherwise edited to reflect this change. If I'd have known that upfront, I would have had the parts printed and waiting for the kit to arrive.
The instructions for setting up the cfg files are pretty clear. Co-print did a good job of isolating their cfg files from native klipper and honestly, I do that with all my printers to make it easy to manage the configuration.
Getting the printer actually set up, as in, how to properly load the filament so that it is ready to 3D print was lacking as well.
The slicer set up is practically non-existent in the instructions. There's a little but on how to barely set up Orca. This may be different if you don't have Orca already installed. Once I had the printer added to Orca, the rest is pretty basic. Thankfully there's an excellent community on the Co-Print discord that was able to get some minor questions, configuration issues, and quirks solved.
There have been some updates to the kit. The 8-in-one now comes with a filament runout sensor, and one of the configuration files has been updated. I really wouldn't have known about the new update as well as some of the slicer settings that needed to be changed wihout the Discord group's help and previous experiences.

Overall:
While the Co-Print kit is kind of marketed at a plug and play solution to add multicolor printing to any printer my verdict is Sort of. Co-Print does a pretty good job of listing out what printers are compatible and they are adding more as time goes along. However, I found the biggest fault is with their instructions. I feel that people new to 3d Printing or non-tinkerers will have a difficult time or feel like they are in over their heads. Clear instructions would solve most of these issues and those that can't, the Discord community is friendly and knowledgeable. I did reach out to Co-Print before my order with a ton of questions and they were quick to respond. I'm in the US and they are overseas, so I expected some sort of delayed response but typically, I had a well thought out and informative response the next day.
So after the install and growing pains, I have a few multicolor prints that are stunning. Once the system is set up and the user understands how to use it, the prints come out great. The chormahead comes with a hardened nozzle so printing exotic materials is not an issue.
Overall, I am impressed with the Co-Print kit and I do enjoy the tinkering aspect of 3D printers but I also like the printing aspect. Now having the option to do multicolor is another aspect that I enjoy.

The only reason for a 4-star review is the lacking instructions. With the quality of the hardware sent, I expected the instructions to match in terms of quality. It took a little digging and asking a question here and there but I was able to get the KCM set installed and operational in a little under 3 hours if you don't count cable management and printing the needed parts.

Definitely worth the price, performance speaks for itself. Once you add this to your printer, the difference is clear.

No clogs, no filament issues during print. Didn’t have a single problem after the first setup.