I really want to build a corexy printer like a Voron
I imagined doing that also. But once I realized the complexity of sourcing the parts and the extreme cost - way above a bambu carbon. Even a Vezbot kit is fat pricier, and all the parts come in one kit - I realized I'd never do it.
Even if this printer needs work, it has all the parts for a screaming price. I expect more people will heat up this cofmpetition, and the price will go down as the quality improves - just like what the Ender and its clones did for bed slingers (by deriving from Prusa)...
I'm content to sit on the sidelines and get the few prints per year from friends by financing filament and offering results from my daily research - I think my price of convenience to buy is around this 500$ mark, once the quality gets better/more consistent.