CNC set from overseas

Hello everyone, I recently had the idea of building a small hobby CNC milling machine. Tutorials and plans can be easily found online.

Now I came across a set from oyostepper.de (http://oyostepper.de/) that was developed by the techn. Data doesn't sound bad and is also good in terms of price: https://www.oyostepper.de/category-16-b0-Schrittmotor-Treiber.html

What I couldn't read here:

• Is the controller a constant current controller (chopping operation?

• In my opinion, the performance of the power supply is not sufficient for all three stepper motors in simultaneous operation.

• Are they hybrid engines? Has anyone here had any experience with oyostepper.de (http://oyostepper.de/), what is your opinion or assessment?