I am very happy with three setups I have at my own, my mother's and my sister's houses using TP-link av500 systems. On each installation (in all three properties) the runs from the input unit to the final unit wifi or other units can be quite large and the long runs do not seem to affect the signal much and from almost every unit I get close to 30Mbps. As these are all AV500 units which I bought second hand on Ebay for very moderate prices, my next question is could I expect very much better speeds with higher spec units? I have been very happy with the performance of the AV500 units as until recently the speeds have been very close to that provided to the router by our ISP but recently at one property (my own home), our ISP has upgraded my fibre connection to 600MBps and so I was wondering if it was worth also upgrading to better powerline units to gain more speed around that property but it would only be worth doing if there was going to be a significant difference. Any thoughts?