I've wanted one also for my F-350 but it's all fine as long as you don't put a load in the back or haul a heavy trailer. Then it looks like your F-350 is a ranger with a ton of bricks.
There is also the issue of having one wheel sticking out of the fender and the other sticking in about an inch making look like your dogtracking unless you add all the parts that they tell you after you have purchased the levelling kit. But they look good unloaded and check the trucktoys website they have tons of pics.