I have done the strutmasters swap before on my current 1997 Mark VIII, I still have the airbags and components as they are still in great condition. But I went to a junk yard one day and saw a Mark VIII in there and it had a brand new Strutmasters kit under it. SO for $90.00 I pulled it and took it home. I did the swap to do the comparison between the two.
Only thing I recommend doing when converting to a strutmaster setup is invest in thicker sway bars. As the air ride is more stable with lateral movement in conjunction with stock swaybars. But the stock swaybars do give way in feel with a strutmaster setup. Just my 2 cents worth.
FYI, I ended up keeping the strutmaster kit on my Mark VIII as I still have the car, it is my performance car with luxury. But I did upgrade my swaybars with aftermarket thicker Addco swaybars for the front and back. The only thing that I lost doing this that I do miss is the automatic lowering at highway cruising, but I will never get rid of my Mark VIII, it is in pretine condition with only 76k for miles.