Product arrived within a few days, connected them to my Home Hub and PC and waited a few seconds and they connected themselves no problem. I haven't measured the LAN speed but internet access via these plugs is really fast (we're on BT Infinity so any slow down due to the plugs should be noticeable but there isn't any so far).
They do feel warm to touch but so does the hub and the power consumption is small no no worried.
A bit more expensive than others but you pay for a good product that works on old wiring (10yrs +) and over 2 floors so on separate circuits.
Haven't tried them on extension leads yet but the instructions say that's fine it just might be slower.