This lil' gadget is fun and can be beneficial, I had been longing for something like this. However, the deal breaker is the poorly-designed "pseudo-cup". No matter how clean your window pane is, no matter how you don't let your finger oil contaminate the cup and window surfaces, no matter how diligently you follow their mounting instructions, this cup WILL fail and your device WILL fall (within days at the most). MAY BE this is worse in cold climate region of where I am, I ain't sure, but I know it as a fact that this suction cup is crap. Don't trust me? Just ask ThinkGeek who is a reseller of this. Their solution is to suggest users to use heavy duty double-sided tape all over the cup inner surface, which I tried but due to the soft plastic in the suction cup, even that failed. There's no way that you can keep this device up for long especially when the car is mobile. Last but not least, the maker is in denial and from what I observed, they STILL refuse to redesign the suction cup. Enough said.