I have a 2013 Camaro. In my opinion, the hill assist is defective in that the delay after releasing the brake is too long. Depressing the accelerator DOES NOT release the hill assist. I have to stop at a hill almost every morning during the week. I watch the other cars accelerate away from my performance car as I wait the obligatory 2 seconds for the crap bag engineering assistance to turn off. I estimate I prevent at least 2 cars from getting through the light. I will not massage the manual brake to overcome crappy engineering. I continuously stalled the car for the first few months until I got used to the Chevrolet Engineering Delay in my day.
I will never own another Chevrolet with this feature that does not offer the ability to turn it off. I have been driving using a clutch for over 40 years. I do not need assistance. And when I say I will never own another Chevrolet with this feature, I mean NEVER.
I have also disabled the 1st to 4th feature which is another bit of crap bag engineering.