TP-Link Deco M5 here, bought a couple of weeks and working perfectly, does everything I wanted it to do which is WiFi all over the house, no more timing out on websites or buffering on YouTube and the app is really good too.
if I have one minor complaint it's that one of the nodes can hold on to a device when you're closer to a different node but it doesn't seem to affect performance, perhaps I could have gotten away with just two nodes instead of three