I would unreservedly recommend the
Moeller Oil Boy Fluid Extractor Kit. Used it this fall on my Atomic 4 and it worked like a champ. Extracted all the oil in just a few minutes (I didn't time it, but certainly less than five) with just the recommended 15-16 pumps, with plenty of vacuum left over.
The only disadvantage I've found with this product is it's tall and narrow, so it's kind of tippy during transport.
Jim