We have installed about 10 or so of these so far plus our in house system Seems like a good IP system. Throw everything you know about ESI away as its not the same feel since its not their system. And for the fact you can install almost any SIP based phone on the system is great. Not tied down to proprietary devices. Although it does come with its own quirks, but maybe these can be choked up to a learning curve. And put along with the forum ESI has, most of your problems can be found on there or resolved.