Also for those who wish they could have standard CC in some circumstances, just remember that TACC is CC, and you can set it to any speed you want. It will drive at that speed constantly and the only exception will be that it will slow down if something is in the way, at which point you would have turned off CC. You can turn off TACC at the same point if you want. Likewise, you wouldn't turn on CC until you were up to speed and unimpeded, so if you do the same with TACC, you get CC. Another minor difference is that if you are zooming toward a car with standard CC, don't want to slow down, but want to make a sudden lane change at the last moment, you'd have to put your foot on the accelerator to do the same with TACC. But it also means that you'd end up illegally close if you are at the point that TACC would have slowed you down.
One issue with TACC as it relates to regular CC is that if the radar is in any way obstructed it won't allow you turn on TACC. Since at this point TACC is the only CC we have, there is no "regular CC." So if TACC isn't working (or if we don't want to go against Tesla's recommendation of when not to use it), we have no way to simply set a speed and maintain it.