I have really nothing but good things to say about my frontier. Mine is an 06. I lowered it 5 inches. However if you plan to lower it, get ready to make your own parts as I have yet to find a company making anything for them. I have plenty of pics on how I lowered mine on my photobucket account. If you have any questions feel free to ask. I will help you all I can.
Heres the link:
http://s186.photobucket.com/albums/x251/lowmaz/06%20Frontier%20Pics/