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Hmm I haven't read any reviews on these but judging by design (and price) I would probably plump for one of these 'PD1' units:
http://www.parkingdynamics.co.uk/
It just seems you'd have more coverage as you could run the 'sensor tape' all the way round the inside of the rear bumper.
Again I haven't actually tried either unit (It's much easier to park the A2 to my previous Rover 75!).so you might find the one you have is better.
Incidently if your checking for price on the 'PD1' check ebay first as I've seen the company who makes them selling them cheaper on there.
VonB