I used it last weekend and it wasn't much improved. The problem is that it can actually be doing OK, and would eventually get where it's supposed to go, but from far away you can't see clearly enough to be sure it's safe, so you end up releasing the button.
If you want to put it through its paces in a complex environment without so much stress, use it while sitting in the driver's seat! Kinda fun watching it frantically turning the wheel this way and that as it makes its way through the parking lot. It actually does surprisingly well sometimes.