I know someone who has the california mirrors and he says they vibrate and like the poster above says, the glass is small.
I am right now in the process of putting the turbo mirros on my 76. I love the look, but hate the quality of the moveable joints. The inner joint tends to loosen up if it is moved much, the screw gets loose, I am going to add a lock washer or some locktite to see if that helps. The inner joint that is the connection between the plastic mirror housing and the metal stem is awful to say the least. It is so stiff that if you let it sit without adjusting it for a week or two then it is literally frozen in place. I have used WD-40, cycle chain lube in a spray can, a squirt of 10W40, and some bearing grease. I have mine at least moving a bit now. The problem will come the first time it is bumped in a parking lot or while walking past in the garage. I am wondering it the mirrow will just break, or if it does actually move, whether I will be able to get it back into position without having to remove it.
Anyway, they look very nice and the mirror surface is hi tech glass, but the build and design quality of the working parts leaves room for improvement..........
Charles