Tipping a lawn mower on its side to change the oil always leads to a big mess for me.  The oil catching pan I place underneath the mower tends to slip or tilt out of position and oil spills out.  I was very pleased with the Hydro-Turf oil extractor - no more big mess.  Someone wearing a coat-and-tie could now change the oil in my mowers!  I am sure that a purist might complain that every last bit of the old oil was not removed.  Probably true and perhaps after removing 80-90% of the old oil I may pull the drain plugs next fall and remove the last few drops before winter storage.