I just had my SDL up to 90 the other day. I know a nice area where cops can't sit and if traffic alows I like to open her up a bit once in awhile. Speed isn't a big deal for these cars, 100 doesn't feel any different then 60. Things just move faster, not to mention the huge potential fines.
Try hitting your brakes hard at 90 holy crap those things work good!
The brakes on these cars always impress me, W126's have big heavy rotors up front that can take a lot of heat. Also they stop better once you get some heat in them.