Have him drive the E500 on a cool evening. I guarantee he'll be happy...EG. I'd wager the S600 would be more comfortable and spacious than the E500 but when it came down to "pants-ing" other cars, the E500 will do that in spades. As I've said before, killing a showroom fresh Vette is one of the greatest perverse pleasures of 500E/E500 ownership. The E500 will also slaughter the M3 (even the manual) unless the M-car is packing a blower. I've noticed and tested that the C43's are not going any faster than the C36's despite 100lbs less weight and more power in a theoretically flatter curve. Don't know why they are underachieving but I've seen too many doing it to ignore it as happenstance or bad drivers. Then again, Michael's 500E pulled off a 1/4 mile victory against Gary's E55 so it isn't an isolated incedent with that engine family. I saw the timeslip, Michael did launch a bit better than Gary but it wouldn't of mattered much as the 500E just kept opening the gap. Once that M119.974 is "up on its cams" there isn't much that will catch you.

Hope this helps...Lee