they are sold out and nobody has reported in on the install or performance? What gives?

They still haven't shipped from what I understand. Check out this thread:

http://www.dieseltruckresource.com/yabbse/index.php?board=49;action=display;threadid=23653

Guy's they are on backorder and will be shipped the first week or so of January. Place you order and wait in line...if you haven't I am in front of you! ;D ;D