I have not used a Dorman intake, but I have used many Dorman parts over the years. Most were just adequate, some were absolutely fantastic and some were down right unsafe. I will say I think sometimes the results are a matter of how carefully the installer followed the directions and clearly the torque values with the Dorman intake appear to be critical.
EDIT: I have been looking at using an aluminum intake from the 99 5.4 2V in case I need to swap my intake.