my thread is alive again:P
Just letting you guys know that my springs have been perfectly fine for the last 3 years.
Still have a 2 finger gap front/rear...King springs haven't sagged or anything. My shocks are still going strong even at 250,000km on the odometer. IIRC the springs were installed at the ~180,000km mark.
Kings lows will drop roughly 1.5 inches.
Not sure about super lows but I wouldn't recommend going any lower than 1.5-2 inches on stock shocks.