Motorola V400

Has anyone tried purchasing one of these car holders that clip onto the vent in your car? I have the V400 and I would like to just be able to toss my phone in it while I drive, but I want to make sure it won't slide out!

I found one like this on Ebay and was just curious if anyone has tried it yet?

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=3 ... »

Thanks!
~FETNU