I used one of those kits on my f350 in September, I haven't driven it yet though.
The kit is kinda cool since it leaves the stock shackle mount in place. But it isn't perfect. The box in plate had to be trimmed where it hit a couple rivets.
I installed it with the radiator support out, but I did try to shove the plates into the frame horns on my f250 that still has a diesel radiator support (tall radiator), it would not fit unless the radiator support was removed to do the install.
Putting the stock bumper back on required trimming the bumper where it hit the new spring mount, and shimming the whole bumper forward a fraction of an inch.
It was all likely less work than making a 92+ kit work though.