Standalone this is a nice phone.
If you are getting it for the expansion ability don't get burnt like I did.
Found out after getting the base unit and one expansion that you can not talk on more than one phone at a time.
Other expandable systems let you do this. (some call it conferencing) Seems like an obvious basic feature very disappointed in sony for shipping such a crippled system.
Also the heading is very misleading. This phone does not ship "with 4-set Expansion". It is only the base unit CAPABLE of 4-set expansion