Have almost all brands but tasted only problems since I the Devolo 550 Duo + have a single problem more has occurred, everything works as it is supposed to work. I am very pleased with Devolo and will only buy in the future this brand.
Note: bought 3 pieces 550 Duo + adapter, all 3 are gestopselt in sockets without earth (2 poles). Despite flawless and very fast data transfers, no interference of the (very old!) Power grid.
