I bought a pair of M5-16 for the network connection between two buildings at a distance of approximately 300m. Although the two M5-16 do not have perfect line of sight, creating a wifi bridge was very easy and it works flawlessly even at the lowest transmission power level. (3 weeks of daily use so far) It's like having a very long Fast Ethernet cable between the buildings. Very user-friendly and convenient mounting system on the pole and the PoE power supply is handy. I haven't tested it at longer distances.