Great little systems and very powerful right out of the box without any external servers etc.

Be very careful when installing them regarding options that you "assume" are included. For instance, I went out on an install only to discover that a paging port was not included on one of the units. Another time, I couldn't get the Polycom phone to do conference calls only to discover that I needed a SIP conference license and that it would work on one system but not on another.

Tech support is outsourced to a couple of different companies as well that are very willing to help.

My opinions are based on a year back so some of the minor kinks may have been worked out.