Yes what he said, my old AV2s topped out around that because the only had 100Mbs port, I've just upgraded to AV2000 from TP link, I have the WPA9610kit and 9020P kit, it was a bit unreliable to start with but upgraded all firmwares and it has been running for a couple of months no bother, only getting 300Mbps transfers but that is over 3 floors and also out to detached garage 60ft from the house, its ~ >3x the av500 gear and the wifi extender has wireless AC1200, no wifi holes throught the house.
Latency seems good but has added a couple of ms running about 10ms on speed test, only have the 54Mb service from BT as I am tight
If your house is empty look at putting in ethernet, you can feed it under floorboards, in skirting boards etc as it will of course be better I should have done this but if you are lazy like me, powerline is a winner.
My router is in the old section of the house there is a distinct speed difference between powerline there and the new parts, new parts of house report 1Gbps connection to each other over powerline but to router in old part connection is around 300Mbps, so only I see 27-30MB/s file transfers as this is probably my limiter, might try and wire to new section of house to see if I get the faster transfers.