I have one and I plan to get another for the passenger side.
The suction device really works. You turn a knob and it sucks itself onto the mirror surface ( same as my Tom Tom GPS EasyMount ). It does vibrate some at 110 kph, but so would you if you had your head out the window at that speed.
It has an elastic that you loop over the mirror, like a safety strap on skis.
On my RAV4, it allows me to see much further behind the trailer, for fast overtaking cars.
Takes seconds to mount and dismount when leaving the vehicle parked.
I went with the normal view version, rather than wide-angle.
baglo