Tazio
I have had the Suplex RS kit fitted to my 1999 +8 for about 3 years now , and I am really pleased with the results. The front end is definitely "softer" sprung , yet retains good damping, and the handling is much better on rough surfaces.
There is a difference in "feel" at the front end , if you prefer the ultra direct visceral (but perhaps harsh) experience then perhaps it is not for you. On the other hand if you enjoy the ability to ride through bumps mid corner without being thrown off course , then you will enjoy it. I would not use it for racing , but for any other sort of Morgan motoring it is (in my opinion) an improvement.
As others have said try to find someone who has had the conversion , and ask if you can try their car. Williams have a hire car which is Suplex equipped if you can't locate anyone closer.
I am contemplating going to the Suplex 5L for the rear, but it is a lot more money and I want to be really sure about this move before embarking upon it.
