hi Huw,
Yes got three running constantly in the house. One is linked to the popcorn hour as I wanted a stable connection rather than wireless. Also plug my work laptop into one when working from home - much faster
Mine are 85Mb/s although the throughput is around 65Mb/s when all three are active.
Yep - I've been running three to connect the household PC's for a couple of years now - but I don't think that anything like the 65Mb/s is actually achievable but it's still much faster than Wi-Fi -very lucky if you get 40Mb/s and possibly less if lots of noise on your ring mains.
Jim