For rigid machining (i.e. cutting metal rather than plastic/tree carcasses) this looks like it might be an interesting option. Aluminium structure/ways rather than cast iron, but that gives you half a chance of actually being able to ship it for less than the cost of the machine itself, and for hobby milling/turning rather than production, 'just do it slower' is always an option to reduce vibration. My main concern would be the price being too low rather than any issues with the machine itself: they mentioned on Reddit that they made their prototype on a $2000 budget, and the Kickstarter is selling it for $4700 + shipping. $2700 is a pretty small margin to work with, and they may end up struggling with business costs more than any trouble actually making the machines themselves.