I used it in 737's when descending and trying to get a some what constant feet per minute. This was in Alaska where we often descended from FL350 without any level off because we were the only traffic.
On the L1011 I never used it because their we could select the feet per minute for the descent.
I was also told in Alaska that there are those who have and those who will, land the aircraft in CWS. Not that I did it of course.........