I've driven the one at our local dealership when I worked there. The rear visability and turning radius are terrible. The throttle is so touchy that backing up and parking requrie your foot on the gas and brake..
The dealership sent one of its technicians for SLR training; it was a two week course!
When I left in late July there was an open recall for the SLR; under hard driving conditions the engine compartment can get too hot for the alternator...

The oddest thing about the SLR is that it has a regular shoulder/lap seatbelt... I'd expect to see a harness in a "supercar".

Someone mentioned the $10,000 front rotors. It dosen't end there, just about all parts have 199 xxx xx xx part numbers; talk about expensive maintence...

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Over 21 years I owned several:
w108
w110
w111
w115
w116
w123
w124
w126
w212