Looking at a Procomp kit for my truck. 99 S/D. Anyone had any dealings with these good or bad. Kit comes with springs and 4 shocks. Price is $550.00 tax and shipping included.

 

They are a little stiff. Pro-comp uses less springs that are thicker for the added heigth. The next most competitive would be BDS. They use more leafs that are thinner for a better ride, and better flex.
I also don't think that Pro-comp actually uses a different spring for the 5.4 equiped trucks, they use the same spring as the V10, wich will add to the stiff ride.
Have you priced the DR kit? It rides the best, and offers better shocks, and is well worth the extra money.