At least Mr Simply Clever has had the intelligence to put a washer jet on the rear camera lens. Most cars don't, so after a 40 mile drive in piddly wet weather the lens becomes totally obscured and useless..
I must admit having had a camera on my Mitsubishi OHEV I would much rather have sensors as they see 'round corners' whereas a camera doesn't. I suppose BOTH is the best bet.
Hope it feels better soon!