My experience with "sensors" is they are completely useless, at least in the environment where I was driving so far. Going nuts for every straw of grass and not "seeing" real obstacles like e.g. rocks, annoying beeping all the time. The system has just too little information to make any sense of it. You just have no idea what the thing is responding to. The camera is completely different animal: You can see what actually is there and most important you can very clearly see where you do not see anything anymore, where its limitation is.
And for reversing, there is one golden rule: Always reverse into any tighter space (like small yard, parking space) unless you make sure there is enough room to turn around, never drive there straight. Because even when you find it beyond your reversing ability, you still can drive out. And usually in a tight space you do not have to worry about any traffic comming from a direction where you do not see anything...
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