I bought 2 of these unit in July 2012. The price was excellent. Overall I found the units easy to install & use and the suction to the windscreen was Excellent (the Garmin GPS used to drop off after 2-3 hours). These units stayed on for months at a time.
I used mine more often than the Wife's as I use my phone (Google Nexus) for Navigation.
I was very happy with both until recently.
About 2 month ago mine broke, the rubber on the suction cup tore around the axis and suction was lost.
A week ago exactly the same thing happened to the one in my Wife's car.
So both units lasted less than a year, one with reasonably heavy use and the other with occasional use. But that's what you get for <£7, so hardly a surprise!