I have the 8112's. Still waiting on the 8100's for the rear.
Here is my train of thought. First off, im only running about 1.5" of lift. Any more than that is not really needed here in AZ. So right away the 51's were out. I think the minimum you can go with the 51's is 2.5".
Now as why I didnt go with Kings or Icon, old tech, Yeah there nice, but at the end of the day its a tube with gas and oil in it and some valving that controls the shock. Top dollar for old tech. Sure you could go to Accutune, but now im spending even more for old tech.
I come from GM products. Im used to magnaride or DSSV dampers. If you have ever driven in a new Z-28 you would understand. The suspension on that thing was incredible. Almost bought one, but that is another story.
So I wanted something that was not the usual adjustable shocks. Then I saw the 8112/8100 setup. See, I drive around with 2 kids, the wife and 2 dogs. And if the wife is not happy with the ride, then im not happy with the ride. If you have ever had people get sick in your car, you understand.
With the 8112/8100 setup there is no compromise. On the highway and around town the wife was extremely happy with the smoothness of the ride. Lane changes, off camber turns and bumps are handled very well. The truck is just planted! Driving is almost so smooth its boring! Im sure when I get the 8100's installed it will be even better. Bumps right now are good, but when the rear tires hit them, your reminded that you have the stock shocks in.
Off road. I have not bombed any trails. I usually drive at a moderate speed. Washboard rutted roads are much smoother than before. I notice myself driving faster than I did before with more comfort. Im talking before I was doing 20-25 and now 40 feels slow and smooth. With the resi I have enough reserve oil there that even tho the temps are above tripple digits, im not going to lose responsiveness of the shocks. You can still tell that the stock rears are not doing a great job keeping up. I really have not pushed these things too much offroad yet.
One thing to note, they do require a break in period. Once they are broken in, there really smooth. Oh, and when you get it aligned, bring a towel, all the tech will be drooling over your setup!!! These things are beautiful!
I will also add, I hear there is a adjustable 8112 in the pipeline and a 8100 that is not adjustable also coming out. Right now its vaporwear, and I have no idea when they will be out.
My final thoughts, If your looking for something that does everything really good, and you like a smooth ride around town, then get the 8112/8100 combo.