Yes, it is rare but handy to have when I need it. In the past when I've used this is when someone in our family got a call from a number not in their contacts list. I would type the number into my phone's keypad and if I had it, the name would pop up (or vice versa if I got a call, they could search for it).
I was just wondering if there was a way to get the same information without initiating a call to someone.