Yes, I spent 2 hours trying it on different images. It recognizes people very well, every photo I tried with people in it was accurately selected. There was just one, a group photo where it could not accurately select each person. I did not expect that it would.
I inverted the portraits and then reduced exposure, clarity and sharpness to blur the background. Then added a 2nd mask of the person and brought up the exposure as necessary so it popped out of the background. I'm not certain that I actually like the result, but it was just a experiment. The photos were at a class reunion last summer and had bright backgrounds and underexposed subjects due to the extreme backlighting which was beyond my control.
I really like the feature but wish there were a select background choice in addition to sky and subject. I'm not sure if its possible to automate it, I don't think Lightroom automates actions but I'll double check. Photoshop does, of course.