Luxury Car Canada (online luxury car magazine) has a "Test Drive Review" article on the 2007 Mercedes-Benz S550 4Matic for those interested. It is an extensive review with photos written by Jil McIntosh. 

2007 Mercedes-Benz S550 4MATIC Reviewed

Base price $122,000
Options $ 10,400

(Premium Package of leather/burl walnut steering wheel, side window roller blinds, climate comfort multicontour front seats, luxury front headrests, heated rear seats, electronic trunk closure, Keyless Go $6,500; panorama sunroof $1,400; Night View Assist $2,500)

Freight $ 1,795
A/C tax $ 100
Price as tested $134,295