Hi Rick,
I have this set up but I purchased it through Stage 3 Motorsports. To address your questions, both paved road comfort and handling I would say are greatly improved over stock. I can't say much as far as off roading because I never took my truck off road stock but I'd imagine it would...
Just got my coil over level put on yesterday. Ended up ordering from Stage 3 Motorsports since it's the same parts. Loving the new ride height in cab vs stock and the improved ride over the bumps on the Michigan roads.