Comparison to Hero Forge:
Cons:
- Significantly worse interface, making it difficult to get an accurate view of the final model for some poses
- Much more limited in terms of outfits, weapons, and options (and that's saying something considering how limited Hero Forge's options already were)
- Body type and overall scale are unchangeable at all (HF has serious problems with this, but they at least try to offer the option)
- The extreme shortage of faces and inability to change expressions is such a severe deficit that it deserves its own mention
Pros:
- Much cheaper
- Better proportions
- Better poses
- Ability to print some separate parts (but not limbs for conversions)
Equal:
- Clipping where part conflicts occur is about as bad as it is with Hero Forge
Unknown:
- Material quality?
Right now I'd say you can do more with Hero Forge in terms of true customization. For instance, Connectamabob's City Watch experiment was maybe 66% successful using HF, but I'm not sure you could even get 10% using CYM. But the HF final products are also awkwardly bulkier and misproportioned (way beyond the tweaks needed for 28mm miniatures) making them somewhat uglier.
Material quality is a BIG question here. CYM has ZERO mention of what material they're using.
I guess it'll be something of a race to see who solves their problems first.