I wanted to post some impressions of the 9 speed auto now that I have a few miles under my belt on it.
I feel like the shift logic could use some improving in that it tends to hold a lower gear longer than I think it should.
For example it will not shift to 7th gear below 30 mph. Once you hit 30 and it goes into 7th you can slow down below 30 a bit and hold 7th. It just feels right in 7th ~30 mph and wrong in 6th at those speeds.
Another example is 8th gear. It won't shift to 8th until you hit 40 mph. Again, once you get it into 8th you can slow down a bit to about 37th and hold it as long as you're not too heavy on the accelerator or climbing a steep grade.
I wish it would go into 7th sooner as well as 8th. The rpms are simply too high at 25-29 mph and 35-39mph which is where we spend a lot of time cruising when in the city.
Another annoyance is the inability to manually select a gear. You put it in L and pick say 7th and it don't mean much other than it won't shift above 7th.
One more example is highway speeds. It will not shift to 9th until you reach 60 mph. Again, 55-59 mph keeps the rpms higher than the need to be in 8th and it cuts into your economy pretty good if you watch this and pay attention.
When the day comes that I can either use HPTuners to play with the parameters on the 9 speed OR a tuner sells a reflash that I can customize I will be quick to do it but until then I've learned to drive around the annoyances. With the ability to customize it a bit I would change the low load parameters to shift into the next gear a few mph sooner. It would change the whole driving experience to me.
One last thing I do not like and I don't know if this is 9 speed exclusive or not but the auto stop is WAY too fast to kill the engine. One gleaming example is when I park at home I back into my driveway. From the time I come to a stop and move the lever to reverse the car has already partially shut the engine off and quickly restarts it as I move the shift lever. Very annoying and I would either program a 1.5 second delay before auto stop or program it to consider steering wheel angle as a factor to auto stop. If the wheel is cranked to one side or the other perhaps delay the auto stop for longer than 0.00001 second?
Anyhow that's my impressions on the unit.