We are upgrading all of our sites to CM5.2 (later to CM6.x) and we have about 50% done - all on 9650s but the newest migrations will be on 9641Gs. Our implementation vendor designed a non-console environment and we are almost 100% IP. We use a 9650 with an expansion module and busy indicators for just key people. This works fine in offices with about 200-250 people. But, we will be migrating headquarters that has about 650-700 people...that phone setup is not a viable solution. I have heard of Avaya One-X - anyone using that without trouble? Or have any other suggestions?