@giffordg 

giffordg wrote

I'm only getting file transfer speeds of 10MB/s......i then realised it is because E4 is only 10/100 ethernet port. 

Is my conclusion correct? 

 

Yes, this is correct.

If I buy an M4 on it's own, and connect that to the router via ethernet, then connect the 2 E4's to mesh with M4, will i then get the full <1gbps transfer speeds? 

i just need to swap the E4 for M4 yes?

 

(I understand E4 is 867mbps on 5ghz so it will be more like at least up to 867mbps)

867Mbps is theoretical maximum. With M4 as Main Deco, expect in real life under 500Mbps on device connected to Main Deco and under 250Mbps on device connected to Satellite Deco.

Your both Satellite Deco E4 should use wireless backhaul to Main Deco M4, of course.

i just need to swap the E4 for M4 yes?

 

Yes. Also, if you can't find single M4 to buy, you can buy single M5 or M9 and make it Main Deco. Same end result.