Mate has a Outlander PHEV with similar features.
It helped him avoid a crash on an off ramp when there was sunstrike, and a car directly in front of him slowed down very very quickly.
It's definitely a feature where if I had the choice, I'd definitely go for it.
I don't keep up to date much on new cars anymore and was pretty confused coming into this thread like no s*** its important haha
Drove a brand new camry in the states in 2017 which had the adaptive cruise control and lane assist and collision avoidance which sounds a lot like this subaru equivalent.
Never got to test the collision avoidance thankfully but on the large highways the adaptive cruise control was pretty awesome. I found the lane steering assist a really odd sensation. It felt like when you have a big gust of wind push you to the side in a light car.
I can see it being a very good way to avoid rear ending someone if you lose concentration in traffic or fall asleep on a long drive etc.