I bought these after I run the TP-Link TL-PA411KIT and thought them here maybe I get more out of. This was not the case.
Have BBB 100/10 with TP-Link got out between 12-20 / 12Mbit.
With devolo, I get exactly the same. So in my case, they made no difference.
Is certainly more stable than the TP-LINK, and is perfect for kicking something for themselves transmitter too. Will not return even though I gave 1200kr for these.
Are you thinking of networking over power lines, I can heartily recommend this product!