I don't trust it! And I would not trust it on any car today. I use ACC all of the time but when I see cars stopped or slowing down I use the regain and of course the ACC turns off. When I need to start back up to speed I use the "gas" and then press resume. Works great for me in all types of traffic.
I do exactly the same thing, using a tap of the regen paddle to cancel out of ACC. For me, it is less of a trust issue, and more that I like the way I slow and stop more than the way ACC does it.