Great write up. I had similar initial impressions.
In regards to the transmission, I do wish there were more speeds, but by no means do I find the 5 speed a drawback. It is very refined and smooth when I compare it to my old 03 Laredo 4 speed auto
A second point I'd like to make is that I have driven many of the new latest and greatest transmissions (my sister has the new BMW 8 speed, my mother the Mercedes 7 speed, and a few dual clutch boxes) and this box feels just as smooth as all of them. The fat power band on the srt does help the lacking in gears. But overall I really like it.
One final point, I have been driving Atlantics with true 5 speed sequential hewland racing gearboxes, and 5 speeds has always been more than enough ratios to drive on.