I have a home land line, a work land line (mandatory), a work cell, and a home cell. My wife has a cell and my daughter has a cell.
I can, depending on the caller ID (and I'm talking about reliable ones from people I know -- like my boss) have GC ring all of my phones, just my phones, just me work phones, just my home phones, my daughter's phone, or just about any combination I want.
Or no phone at all.
I suggest it for anyone who deals with clients and wants their number to remain the same after they leave a job. Get a GC number and put it on your business cards. Link up your cell and your desk phone. Leave the job, keep the cards, your clients may not even know the difference.
It has always been a good service.