Highly effective
Bought to relay the wifi signal from my box (via a 15m shielded cat 6 cable) in a remote part of an old stone house with thick walls, it fulfils its role perfectly.
I measured the difference before and after, and the signal is much improved. On the technical side, I went from 100ms latency to 30ms, and a Gig from 130ms to 3ms. As for throughput, I've gone from 30Mb down and 6Mb up to 98Mb and 15Mb. My signal is even more stable throughout the house when I connect to the router rather than directly to my box.