I owned the 600 and have just purchased the 700p. In all, its great but the conference calling feature is terrible. My 600 was much better at switching between two active calls, hanging up on one, conferencing two active calls and putting them on hold to make another call. It basically allowed me to run my business as if I had 2 or three lines.
Couldn't find any software, so Is there any way to use the 600 phone interface (looks like not much has changed) or are there any programers that could "cut and paste" the old code into the new interface...I do like the the new one in general a little better.