I have an EX-L RES on order. Do you think it's worth it to add on the backup sensors for $570 installed? I know there's already a backup camera, but I don't think this helps much with backing straight out of a parking lot spot, which is where I'm going to be doing most of my backing up (as opposed to parallel parking, which I do very little of where I live). This is the biggest car I will have ever had, so I don't have a good frame of reference. Thanks in advance.