I put 4 Koni FSDs on the front of my 02 Dynasty to replace the OEM Bilstines and they made a HUGE difference!!!!!
After some 600 miles with them, they've made a believer out of me. In fact, my wife and I could tell a difference the first few miles.
Our Dynasty rode somewhere between a dump truck and a Sherman tank. We had weighed the coach (twice) and were careful to set the tire PSI per the tire load charts. Then we had a tire road hazard and ended up changing the two front tires with Goodyear G670. Those tires made a big difference also.
I am not particularly mechanical, but wound up changing them myself. The air leveling system helped relieve any strain or compression on the shocks. Took me 4 hours to get them off but less than 2 hours to install the new ones.
I visited Bilstiens web site and they had a page about "Shock Myths" and they said manufacturers spend millions of dollars to make their vehicles ride the way they do, so don't expect any different ride just by changing the shocks. BS. Big BS. Triple BS. Quadruple BS. I've had both, and Koni FSDs walk all over the Bilstiens. They are in no way even in the same league.
The Koni FSDs cost $150 each plus a couple bucks freight on each. This seems like peanuts to get a multi-hundred thousand dollar coach to ride like a coach rather than a truck.