I thought the MS Wedge Mouse was outrageously expensive. Do you have any use for it when you are on a touch screen? I find the screen becomes "scratched" (i.e. marks in the dust after the S-pen) when using it with a stylus, but it isn't anything that bothers me when the screen is on, only off.
Do you get any heat from the Surface Pro? If there is heat and fan noise I might as well lug one of my laptops around.