Same here although I'd have eto say its not 100% goof proof.
Maybe if missed something but if you move focus off the timeline it no longer controls the time line. Very easy way to unintentionally set a tracks oopaity to 99% and blow your render times.
Also I've had it on the odd time get VV stuck in fast shuttle.
But not that I've sort of organised my workflow around using it it can be a real godsend. On some tasks though I find it gets in the way. If I have to work with really long clips and pull big bits out i find the mouse easier to use.
I have one, and it works, unfortunately I got so used to editing with a mouse and a keyborad it is almost impossible for me to use it. I start out using it on a project and by then end I'm back to the mouse and kb'd again.