Hi @David-TP, thanks for the reply!

As I mentioned, my current set up is a bunch of Deco M5 and M4, with an M5 as the main. For some reason, my main M5 ends up serving most of the clients. Since it's also running on wireless back haul (thus sharing the bandwidth with the front haul), I'm thinking of upgrading the main Deco to a newer and more powerful model. I'm leaving some of the M5 and M4 as satellites since they are only sporadically used.

The reason I'm considering XE75 and X68 is that since they are tri band models, I was thinking that they will help with the performance of the main Deco. However, I'm not sure that with a mix of M4/M5 and tri band Decos, will M4/M5 be able to use the tri band Deco's third band for back haul communication? I ask this specifically for XE75 since its third band is 6 Ghz, my thinking is that the M4/M5 will use the 5 Ghz for backhaul and thus ending up still sharing the bandwidth with the front haul.

If this is true, then will my use case be better served by X68 which has 5 Ghz as the third band? Will M4/M5 automatically use X68's third band for back haul communication (and leave the other 5 Ghz for front haul)?