We're in the process of testing Netgear's HDXB101 mains networking kit.

Although marketed as delivering throughput up to 200Mbits/sec, we weren't at all surprised to find actual throughput much lower.

Initial tests show it to average at around 25-30Mbits/sec - faster than most wireless connections, but way off Netgear's claim. When we plugged one of the units into a four-plug adaptor, throughput plummeted to around 5Mbits/sec.

Another issue we have is the physical design of the units. Due to their bulky nature, you're unlikely to be able to fit it alongside another plug on a dual-plug wall socket.

Despite its drawbacks, it's still one of the fastest mains networking devices we've seen. We'll be posting our full review in the next couple of days.