Was not sure the concept would work well , but we needed a flexible phone conf system for our small office.
Sound quality is brillant, and all the people on the office have synced there variety of phones ( it allows for mulitple phones to be pre-synced so you can just grab the unit anytime ) to the unit, so they can instantly make any call a a conference call.
We have Iphone 3G / 3GS and two very basic motorola GSM phones, and they all work perfectly with the unit.
The analog line input works well as a back up too, and it is mostly plugged into a vonage line , since it is very easily switchable to jump on a bluetooth connect after they have been paried ( a single button ).
Also the PC input has been usefull for use on skype calls.
It is truly the swiss army knife of conf phones, for the modern communicator.
The only negative is it is not rechargable, so it is tethered where as it works with all the cordless phones.