I had an 89 SC - loved it. Put about 85K miles on it before I sold it around 1993 (needed room in the garage). My wife bought a 91 SC. She put about 10K miles on it in 20 years, mostly it sat in the garage. Had to have the Radio/Stereo/Tape/CD player completely rebuild - as age alone destroyed it. A member of the SCCOA specialized in rebuilding them as it was a common problem. Also common was the speedo gear breaking (cheap plastic).
The SC was certainly loaded with advance features for its time. Four Wheel Independent Suspension, 4 wheel anti-lock disc brakes, adjustable shocks that lowered/firmed the ride automatically above 80mph, limited slip differential, SuperCharger of course! Fully adjustable power bucket seats, A/C, Leather interior. Quite, comfortable and fun driving at highway speeds. Put your foot to the floor at 65mph and that Bird would FLY well past 100mph in surprisingly short time.
AIR she paid around $25K for it new in 91 - and 20 years later still in as new condition - the most I could get back out of it was $10K. (with brand new tires as the originals all tread separated from age/sitting).
Over-all loved them both but other cars took their limited space in the garage. I can certainly understand why so many enthusiast love them today.