I'll say it. It's basically useless to us in it's current form. The ACC brakes all the time when it shouldn't (often several times per minute), the autosteer takes detours into bus stops and merging lanes etc. So I never use the autosteer on our X75D now, and seldom the ACC. Sadly Tesla doesn't allow using regular CC on AP-enabled cars, so we are definately not getting AP on the Model 3. I'd decline it even if it was a free option.
I would like regular CC and emergency braking for highway (Like AP1.0 was) as a cheaper option. Just to make highway driving easier