I have installed several ,in the last couple years ,no problems customers love them,In small offices ,they are great most of my installs have been like 4 c.os ,and I use the other programmable keys for DSS buttons because they are lit buttons it works great. Customers in small offices like Caller ID ,and the analog ports. In a couple I have installed answering machines as backup for operator NOTE: THE RINGER EQUIVALENCY NUMBER FOR THE ANSWERING MACHINE <MUST BE .10 ,Most of the cheap digital answering machines are only .05)I recently installed DS2000 with Intramail ,Works Great! For the Money ,They Can't be Beat.