I have a late 07 4.8i and have thus far experienced no major problems. Just crossed the 50,000 mark. Had a faulty electronic module that required a quick stop to the dealer, but otherwise the car has been bulletproof. I suppose you could ask them if the car has received the electronic updates that makes the transmission less jerky. Not sure what the service bulletin # is but a quick search of the forum should tell you. Congrats and enjoy.

__________________
2011 50i BS/Black Nevada
(gone) 2007 4.8i AW/Tobacco