I purchased four 1040s and three 1070s for my church to replace a KSU and phones. These are easy to use and have better sound quality than our old KSU. These have more features and are less than one third the price of a new KSU and phones. They are easy to install in that each phone is immediately aware of the other phones on the line and configures itself. With no KSU, the system is easy to use and maintain, no different than phones at home.