Been using my home built cnc mill router for years now for personal use. Its getting a bit worn and after being shipped with our belongings from Europe to New Zealand , everything is a little out of wack. The Y,Z axis shake while doing 1.5mm doc in 6062 aluminium to the point where I cannot get smooth profiles or pockets. A lot of tool chatter. I have tightened everything up and tried to square things up a little. Im a bit older now and my patients span is short .
So, I'm considering swapping the Y/Z axis out for ready built units. I have been looking at Chinese ones and understand maybe they might be a compromise.

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Anyone have exp with these ?

I want something I can get a decent DOC and feed rate out of without any tool chatter or backlash