Very useful, in my opinion. I wish it was never dropped. I have a 99 Grand Prix and I use mine alot. Whenever the cell phone rings, mute the radio and answer the phone. Great for those of us that can't afford a new Caddy with Gen 6 Onstar with bluetooth.
Its been awhile, but I believe the Reatta's radio and climate control system on on that center dash screen and was "touchscreen" Something, that only your very high-end stuff has today.