I can tell you that my 2007 Expedition EL has been great!!! It has plenty of power and runs like a champ. I have the 5.4L so I can't complain. I am going to get a Hypertech Max Energy Economizer Tuner. I have been reading up on them and they have had some good reviews. I only have 40,000 on my expedition, but once I get home I am sure I will be putting a lot more on it. It looks great, very roomy, and the line in is great too. I plug in my iPhone4 and play my music. I have two younger daughters that love the DVD entertainment system so they are pretty content and quiet no matter where we go. LOL
Don't get me wrong, I have owned a 97, 99 and a 2000 Expedition before this one and they were all great. BUT I LOVE my 07.
I don't have 4X4 on this one, I live in FL so there is no need for it. Other than that, it is everything I would want out of an Expedtion.