Has anyone heard of these no hole/visible parking sensor?

I've come across a type of parking sensor which isn't the usual 4x visible sensors inserted into holes in the bumper, it's inside the bumper:

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=170434089972&ssPageName=STRK:MEWAX:IT

Are they as good as they say they are? Does anyone know anything about them?

Thx

Well , he has a 100% positive feedback so someone is buying his merchandise and apparently are pleased ? Does the product do as well as the rating ? Personally , I have no prior knowledge or experience with said product so I really can't answer your question ? Sorry !