I have used RS about 10 times now... Most times, in Watch me mode, it does real well avoiding trees and keeping me in the shot. However, on a couple of occasions, I have had to take over to make sure it wouldn't drift into a pine tree.
Yes, it turns and only moves forward to detect the obstacles. However since there are no side sensors, it has come a couple of times within an inch or two of a branch...
I don't think it's an isolated issue either.. if you watch RS videos on Youtube, there is definitely times when the H drifts or clips a tree...
RS really is a work in progress. And at the end of the day, I really think it needs more sensors, all the way around.