We started using integrated phones in my office and yes, there's definitely a learning period, but when you're on the computer and phone simultaneously all day long, the integrated phone system makes it all easier. I can see who's calling, where they're from, what number -- everything.
An integrated phone also makes transferring calls a cinch. I don't have to look up the number -- I just type in the name and the system does the rest. It's a much more efficient way of doing business than having a traditional phone system.