kubacci,
I do not know what country you are in but here is what I know.
If you are buying directly from Aliexpress or Ebay here is the problem you will run into.
1st if you buy from either of these suppliers, they are only that, suppliers.
If you have problems or questions on the operation of the machine they will not know the answers.
2nd you say you are going to use Fusion as your CadCam program. You will need to make sure there is a post processor
for Fusion that will work with Mach 3 controller. I do not work with Mach 3 but I do not think it works easily on 4 axis machines
or if Fusion has a 4 axis processor for it.
3rd The best way to by a China manufactured machine is through the manufacturer. They can give you assistance after the sale.
Hope this helps..