Have you adjusted the response settings of the SCC? I find with the default "Normal" response setting, the car tends brake hard and accelerate quickly a lot of the time. But by setting the response time to "Slow", nearly all speed adjustments are very smooth. And, of course, as with all semi-autonomous tech on cars, you do have to remain alert as well as no system is perfect.Terrible, terrible "Smart cruise control" We were in Poland a month ago and we used to drive one-year-old VW golf in our holiday. it was hugely different, very smooth Smart Cruise Control, I loved how it works, I can rely on, but Hyundai ioniq? - never! It's a very, very huge difference. I know the price between VW and Hyundai, but if I buy something at the price, that means it should be ok? No, it is not! The problem, problem, problem..... and - problem. WTF?