You know, that's the one thing that I remembered reading somewhere that kept nagging at me and convinced me not to do the perch mod. Well, guess what? I can't tell one bit of difference in ride harshness. Now granted I did the sway bar delete at the same time which changes the ride as well. Makes it lean a little more if you do a hard corner. Off road today I hit some huge washes at an angle and feel like my tires stayed planted on the ground more than they used to. Hit my normal washboard roads at speed today and the Raptor felt more controllable and didn't "walk" around as much as before.
Seriously, unless your Raptor is a pavement queen, DO THIS MOD NOW! You won't regret it! This is how the truck is supposed to feel. Even if your Raptor doesn't get offroad, I didn't feel this mod was a detriment to handling on pavement.