I have about 7000 miles on my Spicer UD60s front and rear. Been to Moab, hit tough trails, been to off road parks in Texas, etc., goes 90 MPH down the highway, no problems. Hitting the Rubicon Trail next month. I think they are bad ass, but I know others will prefer the choices Dynatrac offers. Dynatrac is a great brand but comparable Dynatracs are about $5000 more.
The brakes are off of a Ram 3500 and 17" slabs are too tight. I suggest 18" slabs.
I installed them myself with the help of a couple of friends. Everything bolts up nicely. New drive shafts are obviously needed. The ebrakes are tight, but optional part numbers for longer lines are listed in the literature, as well as an upgraded master brake cylinder. I am running stock JKU ebrake cables and master brake and they work fine, but the suggested ones would probably work better.
Good luck with yours. I love mine.