Has anyone had any experience with one of these?

http://www.quickoildrainvalve.com/

i read a review a while ago about them, wish i could find it now. According to the review, the drain valve's work very well, except for the fact that they don't let all the oil drain out of the pan. This is due to the fact that the threads of the valve, go inside the oil [an, and extend past the wall. There making a small lip that the oil can't get over.

I researched these, because I was going to put them on all the family cars. But I later decided it wasn't worth, considering it takes 5 seconds to undo the drain plug in the oil pan.

I want one for the DMAX