I had the windshield suction kind, but I hated it. This one clamps onto my dash. More secure, less vibration, under the tonneau when half closed, and more discrete.
Adjustable Swivel Clip Clamp for Mounting IPHONE 5, 4S, 4 Video Camcorder Monitors by ePhotoInc SharkClipH6804
http://amzn.com/B0060F03PQ