Between the old 190E 2.6, the C230, Dad's C230, and our E300D-t, I have done at least 30 changes with my LiquiVac. I have yet to have the tank collapse, but the seals are wearing and I'm going to buy a kit to freshen it up. I do the changes with the oil hot and the tube does collapse somewhat, but seems to work well.
All in all it was worth the money and I would not hesitate to buy another.
1998 C230 "Black Betty"