I have/had several pairs of Rudy's and for the most part I like them. The X2 photochromic are problematic in one area. I bought the red because I'm in an area where you go out in sunlight and come home in fog. The problem with the X2 is they basically go clear in those cases when you actually want them red. I rolled back to the earlier version which was available for some of the glasses and it worked great, less range on the photochromic. Also, the brown and red might as well be the same lens, even if they are, slightly, different.
I've never checked to see if they could be driven over by a car, and recover, or deflect bullets.
I'm really not sure on the HUD with any sunglasses. I really like my polarized Agon and I just don't think the HUD would fare well. I'm also not sure how it would work with lens in different colors. It's definitely something to test before you spend the extra $1,800.