I just recently replaced the shocks on my 2013 F350. It is not quite 6 months old and I have ~20k miles on it. Some of those miles are at max GCVWR.
I ended up getting a good deal on Rancho rs7000mt's I was choosing between these, fox and bilsteins. What really put it over the top was that everywhere on their website they make you feel like they are made in the USA. It is at the bottom of every page -- go look
http://www.gorancho.com/
Guess what, not made in the USA. Sticker on the end of the box proclaims "Made in Canada". Don't get me wrong, I buy foreign stuff all the time, but when I have a choice I buy domestically. Basically I feel Rancho is duping people and this aggravates me more than most. I could have returned the shocks but my friend did me a favor and I don't want to be a jerk over country of manufacture BS. I might think about the 90 day ride guarantee however. Anyway /rant off
The shocks were pretty easy to replace, took me a little over an hour to do all 4. The ride seems better, not OMG better but a little more controlled. I will update as I get some miles on them.
Interesting to note that both of my rear shocks appeared to be leaking already. They were also very easy for me to collapse by hand, the Ranchos were much more difficult. Ford appears to be using pretty much junk shocks.