Hi 

Need to coverage some more areas at home to the garden , have got a setup of Tp deco x50 x 3 at the moment . but was planning to add 2 pairs of the tp deco m4 . First m4 is going to be connected to ethernet cable to cover area  and the second m4 is via wifi 

Any known problems when mixing x50 and m4 ?  

No problem connecting the m4 with ethernet  ?

I know of the speed issues with the m4 , but that i can live with in that "backroom area" with those devices that is connecting to it  all main devices is going to be connected via the x50.