SL is a 'really cool' car.
I have a 1964 Triumph TR4. When I drive it, people grin and wave. When I drive the SL, people don't grin and wave, they just look like they WISH they had one.
Car is incredible in every way, and a joy as a daily driver. Our biggest concern is putting too many miles on it, thus making it hard to sell for top dollar, and IMHO, the car is too technical to keep forever and enjoy like my TR4.
Car is white, black softtop goes down regularly this time of year.
Have driven Z3's, no Z4. I just want a silver Bimmer to go with my silver Beemer K1200RS motorcycle.

MikeK