I've had my 2001 S600 since August 2000.....had dealer install K40 package front and rear with "laser mitt". It has worked fine for both radar and laser. Good eyes are still the best defense.
Only reason I got it.....wasn't to speed around like crazy....but for highway driving where I do 80mph in 70mph zones.......just don't want to be a "quota" pullover.
When I have the need for speed....I pay $$$$$$ at Road Atlanta, put on a helmet, and wear out the tires on my Z8. If I mess up on a turn.....I don't take out a minivan loaded with kids......just ream up a lot of grass and dirt into my wheel wells.