Wifi has proven to not be reliable and I get disconnected from my Flex usually every hour or so. With the Maestro coming soon (this year?), I would like to have a more reliable connection. I plan to run Ethernet to my shack, but haven't wanted to dig through 18 inches of insulation and drill through the top plate.
I am using an Amped extender. Using the extender with the antennas that came with it was virtually worthless. I got my self a large parabolic antenna mounted on a tripod and connected it to one of the ports of the extender and pointed it at the router. The 25 dB gain reflector did the trick.
My Flex and shack PC are wired to an Apple Airport Extreme set up as a wi-fi extender. The rig and computer have DHCP reservations, so get the same IP address, and can talk to each other mo matter the wi-fi situation. I use 5 GHz from the main Airport Extreme as the "trunk line" to connect to the internet, so it stays away from all the 2.4 GHz noise and competition.
Much easier than running cable, and quiet, too. I get a good 500 Mbps on the 5 GHz path, so am pretty happy with it.
With the powerline type of adapters, your remote adapter might be on a different circuit and there will not be a direct wired connection between the server and the client. I had this problem before I went wireless with my parabolic antenna and connected .1 microfarad capacitors between the circuits at the breaker box. However, if you are not familiar with how houses are wired I'd hire an electrician or go the wireless route.
I use a PLT device to extend my cable TV into my bedroom and have to unplug both ends when I want to go on the air.
The British regulator (OfCom) has published some new regulations regarding acceptable levels of interference but I think that there are still many old PLT devices which cause bad interference. BT's one which they use to extend their ADSL to the TV set-top box seems to be one of the worst offenders!
Until this week, I was running both my 6500 and my Dell Inspiron laptop on the same wired LAN through a NetGear switch. If I tried to use the laptop as a wireless device on my 2.4Ghz WiFi network then the latency was so bad that the laptop kept dropping offline. I added an 802.11ac (5Ghz) dongle this week and it all works well now.
The radio is a Flex 6300 with the primary antenna being a GAP Voyager vertical (basically a vertical dipole, not a typical quarter wave) about 80 feet from the house. I have not experienced either RFI into the router from the radio (run an ALS-600 amp) or any obvious RFI hash or spikes from the Linksys router or it's wall wart. My impression is that power line routers use 200 - 400 KHz RF over the house wiring. I suppose there could be harmonics into the ham bands but obviously, the fundamental.
In fact, you can see a squished view of SSDR on the big TV in my profile picture.