I have a Haynes manual for my 201, and I think it's quite good. I'm sure it's no where near as comprehensive as the MB Service CD, but hey, it was $15. I find it a valuable resource when used in conjuction with this site. Definately worth the very small investment.
Just my my 2-cents (arguably worth that).
'92 Mercedes 190E/2.3 (247K miles/my daily driver)
'93 Volvo 940 Turbo Wagon (263K miles/a family truckster with spunk)
'99 Kawasaki Concours
'85 Jeep CJ-7 w/ Fisher plow (226K miles)'93 Volvo 940 Turbo Wagon
'53 Willys-Overland Pickup
'85 Honda 750F Interceptor
'93 Nissan Quest
'89 Toyota Camry Wagon
'89 Dodge Raider
'81 Honda CB 750F Super Sport
'88 Toyota Celica
'95 Toyota Tacoma
'74 Honda CB 550F