There are a few differences between the two, which are listed on his site. A few I remember are:
-2 layers of fabric on the bottom instead of one, also the bottom layer covers the side pockets and drink holders. On the regular model it only covers the main compartment
-Smaller pocket inside each large side pocket as well as an extra pocket in the large zippered pouch in the front. Also a key ring lanyard inside one of the side pockets
-LE bag is 1" taller
-Has better quad hookups on the back, which also fold out of the way if you do not use quads
And Chris, I just placed an order for one of the LE Silverbacks this afternoon. Can't wait to get that badboy, it looks killer!! I sent you an email with a quick question about the bag.