MMI control stoped working.

[RMConey]

My control unit has stoped working most of the time nothing works but occasionally I have the option to switch to radio and cd thankfully the volume controls are on the wheel. 

I was quotes around £950 for a replacement from Audi, shocked I looked online for a second hand working unit. I’ve found a few second hand units and new boards coming from China for around £50. 

Has anyone used them before, are they any good or should I stay away and stop being tight and just look out for a used replacement. 

Thank 

Reece