@Daniel_Utsch 

You could use the M5 to tap into speeds above 100 Mbps. The actual speed results will depend on your environment. However, say everything is a solid connection, the E4s are connected via Wi-Fi, you should see an improvement.

@Tony 

Thanks a lot for your answer. But would it be better to buy a Gigabit pack, like M4 or M5 to change my E4s or I can stay with them and just add a M4 or M5 as the main deco connected with the Internet modem? Will the results be the same? 

@Daniel_Utsch 

The wireless specs of the E4, M4, and M5 are all pretty much the same so that would stay the same. The biggest difference is using a Deco that has a gigabit port to get past the 100 Mbps LAN on the Deco E4. 

So what I would do is to try just getting one M5, and having that as my main Decos the E4s communicating over Wi-Fi would be the same if they were M4s or M5s.

@Tony 

Thank you so much. I will try that.