Hi everybody! I'll try to answer a few questions that were asked on this thread.
Yes, I've seen the system in action.
ECartman is correct, it is Asterisk based system with drivers to support Nortel UNISTIM and digital sets.
It does not have CallPilot - as it is based on Asterisk, it uses the Asterisk voicemail system. Norstar/BCM feature codes are used to access various Asterisk features (including voicemail), so for users from Norstar/BCM environments the migration is very easy.
As a replacement for BCM400 with 60-70 i2000 series phones, UCx450 would be a very good fit.
The MSRP for a basic UCx50 system with a license for 10 extensions is $1950. SIP phones (Nortel or other), Nortel IP phones, Nortel digital phones and IAX2 phones are supported. BTW - the license covers all features of the system (there is no separate licensing of features).
Programming of features on the phones works the same way as on Norstar/BCM (F*0, F*1, F*2, F*3, F*6, F*7, F*80 are all supported). Jeremy, if you expected Element Manager to be used for programming, the asnwer is no. The system uses a Web-based configuration utility.