I'll repost a review of a powerline kit that I had posted in another thread:
Alright, I'm back to report my findings. I ordered this powerline kit from Newegg on sale for $20 so I figured I didn't have much to lose. As you can tell it's pretty much the starter kit so it's only the "200mbps" version, I know there are several steps above this type of model including "500mbps" and "600mbps" versions.
Set up could not have been easier, plugged my router into the unit in the first socket, plugged its mate into a socket in the same room, pushed a button on both to pair them, then moved the second one out to my living room where my HTPC is. The connection now shows up as a standard LAN connection on my HTPC.
Performance however for this kit is just "okay". Using LAN Speed Test Lite which tests the transfer speed sending files between my computers, it appears that this "200mbps" kit gets about 25mbps download in actual testing which translates to 3.125MBps. For upload they tested at about ~19mbps which translates to 2.75MBps in real world file transferring. Pinging Google with the command prompt reports an 18ms ping, which is directly in-line with my computer that's hooked up directly to the modem, so no negative impact on ping.
My powerline kit is at a bit of a disadvantage because my units are on separate circuits, but for most people if they were on the same circuit the units would probably be close enough to just run an ethernet cable. For me this kit represents a minor boost in stability and speed over my wireless connection in my apartment due to the amount of wireless interference with the 9+ four bar networks that are surrounding me.
Conclusion: I recommend powerline kits for a certain set of circumstances. If you're like me and have to fight your neighbors for airwaves, or if your walls are extraordinarily thick and a single wireless router doesn't fullfill your needs, then powerlines can definitely be a major player in your network. Though I don't have experience with them, I would recommend the 500mpbs kits if you want to do some serious file transferring on your network, because 3MBps doesn't get you very far very fast.
If you find yourself in a modest-sized home, with a sparse population of neighbors nearby and your standard wood frame + plaster walls, a decent wireless N router will give you a lot more utility for the price than a powerline kit, transfer speeds for wireless N can fairly easily achieve 10MBps within 20ft or so.
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