If it's the truck you want and the price fits your budget, and it seems like a good deal, you should get it... :)
I got my 2013 F150 for 10k under the window sticker and all the numbers worked for me, so I have that truck in my garage now.. :)
I'm sure someone else could have gotten a few more grand knocked off or I could have kept shopping, but I'm just not a "sales" type of person and I found a truck that fit all my needs and then some, so my set of stars were aligned. :)
Good luck!
Mitch