That price is the same as what i ended up paying. First time i have used parking sensors. Haven't hit anything reversing, but then I haven't done that before either!
I think they are worth every penny, and they don't stick out to much (body coloured). I chose to get them as the rear visibility isn't great, and figured it was good idea to hopefull never hit anything. Also the 'beep' it gives when selecting reverse is, er, nice?!
If i get home early and noone else has posted a pick I'll get on it (if I can be bothered - it is friday!! yay!!). But i think there are picks in the forum and gallery.