Night and day. I've seen huge improvements myself and I took delivery only last autumn.
As for rain, Gulf Coast downpours on Interstate with so much traffic that you get that secondary mist wall form and I saw no issues. Well I had a very hard time making out the markings, a lot of the time I was just following lights and using retaining walls and ditches as landmarks to judge how well the car was doing.
P.S. Could be problematic for heavy snow conditions, I think people have reported wet snow building up enough over the sensors to create issues?