For routine maintenance, I had question they are perfect. However, when inquiring about a hesitation issue, pretty much all the advisor could state is it is the computer that controls everything so will will experience this. I got online w GM & reported I'm having this issue & was told this is the 1st he'd heard about it. I spoke to a higher up at Finnegan & he told me the know about this. Issue & it's probably due to the new 8 speed auto tran. After which I told my adisor this, he is to call me this week & set an appnt & give me a loaner & check my 2019 Sierra out.