I wished GM offered the HUD as a separate option. Can't say I have any remorse since I wasn't going to get the 2SS or 1LE package for it.
The only 2 bits of information I'd like to see projected are the RPMs and to a lesser extent, speed. Don't need Nav and all that other clutter. Doesn't need to be in color either.
Luckily, there's some aftermarket options I'm about to try like this one:
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
Should get the job done.