Sam there is a good thread on that in the Installer's Forum from December 2007 when we got an order for multiple offices. If you can't find it, let me know and I'll help you dig up the link.

On a sidenote we deployed over a hundred GN9350s from Jabra. The plus is that no one knows you're on a headset. My only complaint (and this is me, not my users) is that when I walk into our datacenter, I have trouble hearing some people, especially females. I won't say it's any worse than any other headset, but I'd like to see a bit more volume in the unit. It's just that our data center has a good bit of A/C ventilation noise so if you're talking to a female, their voice can be a bit harder to hear than when using the phone itself.