So I ordered and SE V6 with everything about 5 months ago - the car was built last month April 2007 and delivered in May.
One of the big things I was curious about was the transmission; would all of the problems be solved that I was hearing about. I noticed many people had problems but they seemed to be largely isolated to the earlier builds. Some of these posters were particularly vociferous. I could never get an accurate assessment of a new V6 tranny no matter how hard I looked.
Here is my impression on a new camry v6 transmission after 800 miles.

- the transmission is still not functioning to a quality standard which I attribute to Toyota. The big issue seems to be that the software is poor and it would seem that the root cause is poor clutch pack control under light load.
What happens is the transmission exhibits the "slipping" problem which rears itself tamely as 250-300 RPM throttle blip between 1st and second when cold, followed by clutch pack engagement. The 1-2 change is barely noticeable but has happened twice in the first 800 miles. The more concerning behavior is at about 30 miles an hour when lightly accelerating from a coast - and in this case the engagement is quite harsh resorting in a very noticeable shudder.
This only seems to happen under light load conditions, the transmission performs well on high loads.
My conclusion is, these issues to not appear detrimental, it would seem the clutch pack is probably taking the brunt of the issue but it's probably well within design tolerance at these light loads. However it is still an irritating problem to those who notice such things. Furthermore it does not appear that the transmission problems are fixed on cars being delivered in May 2007 such as mine, which is >1yr after SOP.
I thought I would share this, again it was information I was looking for when deciding to purchase and I wish it was available as it may (probably would have) have changed my mind.
-Matt