I have the Suplex on the front of my 1999 4/4 4 seater.
I also have the stainless steel kingpins and replacement roller bearings.
The ride is better, the St Malverns dance at the front end has gone, the steering is much quicker and I no longer live in fear of road grids so it is worth the change.
so ride better
handling better
road holding probably down to other variables.
I do recommend the change, also have the Mulberry spaces to move the axle square in the wheel arches, also a pan hard rod, all these changes are worthwhile.