Wife had an '08 4.8i and it was a great vehicle. Fully loaded and didn't have any problems with it. She now has a '12
I personally loved the 4.8i engine, nice grunt and sounds good too. Just keep an eye on the tires. I didnt have any issues, but I know a few people who have seen bad inner tire wear and went through tires. Seems like you need to keep an eye on the alignment perhaps. Bit of a gas guzzler, but so is the ///M so doesnt matter to me.