I got an R50 a couple of weeks back, and have been wanting to make time to try out the Advanced A+ feature in depth. That hasn't happened, but I did take a few random shots with it, often not seeing any difference from what I would have normally gotten, or much benefits.
But here's a shot that really surprised me (in a good way!). Excuse the poor photographic quality of the shots, here we're talking technical. The jpegs are full size, as generated by the R50, but I did compress them a bit to get the sizes down.
I was focusing on this sprinkler with 800mm f/11. First I used Av mode, then I tried Advanced A+. Spot the difference:
Av mode:
Advanced A+:
For one thing, I chose ISO 100, with which I got 1/40 sec exposure time, while the A+ mode chose ISO 2500, with 1/1250 sec.
However, the bigger difference - note the picture itself. When I took the first picture, I was just taking a photo of the sprinkler head. Only when I looked at the second photo did I realize that there was a lizard in the background, and that the A+ mode managed to include the sprinkler head as well as the lizard in focus. Both images are f/11 (don't have a choice with that lens!), but clearly the A+ mode chose to do some focus stacking. In fact, at those settings, the depth of field is less than 2 inches, so I don't think it would be possible to get both in focus.
I had the camera in silent mode, so I didn't hear how many shots the A+ mode took. I don't know if there's any other way to tell.
Finally when I realized there was a lizard back there, I took an Av shot focused on the lizard, which does show that the sprinkler head isn't in focus.
Av shot focused on the lizard:
Another nice surprise is that for this third shot the R50 was able to focus on the lizard's eye, even though it's partially blocked by the leaves.