I read a post on TDR from a guy that got 67A, here’s his commentary;
Unfortunately, the dealer applied the update before I could tell them not not to. The two things that I have noticed since getting it (well, 3 if you count the fact that I now have heat), is that it has some rough idle spells when then the engine is cold that it didn't have before and I've noticed that lifting off of the throttle at slow speeds (again, mostly when it's cold), my truck's forward momentum just absolutely dies (like driving into sand or something), where before it would glide and I'm not going fast enough for the e-brake to engage. Overall power and fuel mileage seem to be okay so far, but it's only been a few weeks.