[guenthert]

I didn't notice overheating, but there are a quite a few different products on the market.

The modest speed (~50MBps at my place) was then ok-ish, but the (variable!) latency of a couple of ms was annoying (it tended to break pacemaker/corosync cluster communication). And every once in a blue moon they stopped working altogether and needed to be un-plugged.

Worst, for someone interested in analogue electronics, they emit (of course) a huge amount of electrical noise into the power lines.