My experience is that the Cisco and Polycom phones are both about in terms audio quality and useability. Neither one does exactly what I'd expect with respect to multiple lines. They both take a little extra setup in this regard, but you can read the wiki for that stuff. Snoms do exactly what I'd expect for a multiple line phone, are very easy to setup, but the audio quality and usability do not compare favorably with either Cisco or Polycom.
If you've considered the Snom, you might also want to test a Zultys 4x4 or 4x5. I picked a 4x5 up off of ebay recently and have been pleasantly surprised by it. While I don't currently have a Polycom to compare it with, I would rank the audio quality equal to the Cisco's. It also just 'does the right thing' with multiple lines - only one registration, no hints needed. Can be configured through TFTP with both default and phone specific config files. Software updates are freely available from the Zultys website.
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