Funny marketing. "We invented this CNC lathe..." There is nothing there which hasn't been done by dozens of people.
On the one hand, that seems like a lot of money for a couple of rolled ballscrews with anti backlash nuts (about $300 worth) with $200 worth of steppers and drivers, and about $50 worth of break out board, and spindle interface. That means you are paying about $850 for a couple of aluminium motor mounts and mounting parts.
On the other hand, they look like they have things running about as well as you can expect from a 7x. They look like they have matched the motors drivers and leadscrews well to the machine.
You have to wonder how bolt on this is. The Sieg 7x are not exactly accurately machined. How do you locate the holes at the end of the bed?
I don't like the layout. They add a lot of length and especially width to a compact machine.
I did my 7x first conversion nearly completely on the lathe itself. Since then I have changed some bits with milled parts.
Bolting on motion control does not address some of the machine basic issues.
Replace the chinese bearings (I haven't done the tapered roller bearing mod, but it is supposed to reduce chatter).
Correct the variable bed thickness.
Increase cross slide travel.
Put on a more powerful motor etc