Summary: I unpacked the adapters and hooked them up according to the instructions; one connected to my router, the other to a computer. While my wifi connection gave me about 12Mb download speeds, the best I saw with the Zyxel was about 2.5Mb. Even moving the laptop and 2nd adapter to the same room as the one connected to the router still only gave me about 2.5Mb throughput.
ZyXEL flash upgrade program says I have a counterfeit item
A. Chase Turner, Amazon
2 April 2012
Summary: I purchased these items in 2010. About 6 months ago, they stopped working. I went to ZyXEL web site to download a firmware updater. Firmware updater found the devices, but said they were not genuine ZyXEL devices. Very disappointed. I wish Amazon had a means where by I can select "Items available for Prime Shipping" and "Items whose authenticity are guaranteed to be 100% supported by the OEM"
Summary: I've used these adapters for nearly 9 months, to provide network access in a room remote from my broadband access point, and am finally giving up on them. They drop connections frequently, often after only a few minutes. They must then be unplugged and replugged to reset them. I need something with dependability. I bit the bullet and bought a second Airport Extreme base station and set it up in bridge mode. Now I have a fast, stable connection.
Summary: Despite claims to the contrary on Zyxel's website, these are not compatible with any earlier models. After following their recommendation to upgrade the firmware on my older 401v1 plugs, I'm now left with 4 plugs - 2 of which had worked fine for 3 years prior to this - that simply will not talk to one another at all. Save yourself some money and buy something reputable.
Summary: This is the second, out of two, complete failures for ZyXEL products out of the box. These units work fine when they are plugged into the same plug socket, next to each other. Across a slightly larger distance but on the same ring, I'm seeing latency of 400ms. Across rings and out into the garden, which is where my old 85mbps adapters worked without a problem, these don't even recognise there's another device there. Steer clear.
Summary: Beware - I upgraded to v3 from v1 because I found it was running hot and didnt always work. having installed the v3 I found - like others - that after a month or so the units start to work intermittently. There is no obvious reason and I have wasted a lot of time trying to diagnose why. ZyXEL PLA-401 V3 200 Mbps Homeplug AV Wall-plugged Adapter - Twin pack I am going to try to get a refund and pay more for a reliable make.
Summary: I got a pair of these a while back and they didnt work. After updating the firmware, they worked, for a bit. I actually have 4 of these - utter garbage, as 3 of them are non-functional (no lights on). They are too fat wide, overpriced and utter rubbish.