I have both a topsider as well as a extractor from motive products. The topsider isn't large enough to get everything out in one shot, and that is a pain. The motive products extractor is quite nice and has enough capacity. Their brake bleeder really works well. On a W124 there isn't much to see underneath unless you pull the noise encapsulation panel - so there is no real benefit to getting underneath to change the oil. I used the topsider to drain (most of) my transmission. That worked well and reduced the mess underneath when pulling plugs and the pan.

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1987 300TD 231,000
#22, afterglow, plastic fan, euro lights, alternator upgrade, cluster housing update