As you may or may not know, 3Sharp played a part in the UC launch. The keynote demo given by Eric Swift was implemented and supported by Peter Kelly and myself. The launch event itself was amazing, and if you ever get a chance to attend one I highly recommend it. A few notes on the keynote demo though: The audio quality of the webcast didn't do justice to the capabilities of the voice portions of the demo. Voice quality over all the attached devices (including and especially Round Table) is excellent. It does not, however, benefit from piping over a PA. Outlook voice access appeared to have a hard time understanding Eric's commands. This only happened when he was hooked up to pipe the sound over the house audio. I use OVA on a regular basis here at 3Sharp, and never have those problems.
The big point I'm trying to make is that these features work exceedingly well in the real world, and the sound quality is top-notch whenever you add voice to the mix. Watch the demo and pay attention to the features being shown, and remember that when you use them the quality of voice is likely to meet or exceed that of your PBX.
The keynote can be found here for those who missed it: http://wm.istreamplanet.com/customers/ms/10162007_300k.asx