I have three different powerline adapter brands and all of them work fine at 100 Mbps with atleast three other different PCs and laptops. I can only manage a stable 10 Mbps full duplex connection with the i218v on my T450s. I have the latest drivers, etc. The connection can negotiate at 100 Mbps, but it immediately becomes flaky, and ping times are around hte range of 2-3 seconds even to the local router. I'm pretty sure this is an intel adapter specific problem. Sad to see it has never been taken care of (as there are many other open threads on this issue from a few years ago).
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