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When I go to Car Diagnostic: AUTOBOSS STAR it says "It lacks the full capabilitys of The MB STAR Diagnostic System but has alot of the basic tools you need to diagnose mercedes cars."I have the Star Autoboss scanner and can full access the 129 SL as well as other MB's
Comparing system coverage to the Carsoft scanners I have this AutoBoss is a little better with the newer M-Bs. But for the R129 it seems equal to Carsoft and covers about 2/3 the available systems with the major deficiency of both scanners being lack of coverage for the roll bar and top control systems.