I've tried all manner of GPS mounts:-
1) Yoke mount - Yuck!
a) It snacks my feet as I squeeze into the driving seat.
b) It impedes the yoke movement when it interacts with my muscular knees! Follow on comments from those that know of my lean, athletic build and who make snide remarks about obscuring of the screen by the rippling muscles of my abdomen should be discounted.
c) I have to look waaaay down to see it, thus spoiling my scan. - If used with the inbuilt aerial, it can lose signal.
2) Screwed in mount on the eyebrow - OK
3) Specially made mount (Dillon) for Grummans - Nicely in the eyeline and solid - Used when going solo.
4) The Jeppesen bean bag mount thingy (I think they call it a "Friction Dash Mount") - Excellent - Can travel from a/c to a/c to car to lorry to pram to whatever - You can plonk it anywhere - I use it when the whim and fancy takes me and if/when I want my passenger to see where he/she/it is going. Also good for excercising on the apron whilst waiting for the fuel man.
Your views may vary.