The extractor that I have uses a small diameter nylon tube that I place down inside of the dip-stick tube. This allows me to go to the bottom of the oil pan and suck out all the oil, without leaving any on the bottom.
Will it get every drop? Who knows, but you're splitting hairs here.
This is the unit that I have:
http://www.amazon.com/America-5060-T.../dp/B001445IZ8
I also use it on my cars. It's so easy and you don't get a drop of oil on yourself if you are careful.