I have a buddy who loves Fumoto valves and constantly bugs me about trying one...the OP here is a perfect example of why I won't do it.
My drain plug is easy to get to and not especially well protected, so I'm fine with using it in good weather. I have a vacuum extractor for cold days, suppose it might come in handy if it rained for several days when I wanted to do a change, too. I like the idea of pulling the plug to get as much crud as possible out of there, not that I've seen any crud coming out of my car...yet. The vacuum extraction also takes a little while, but no big diff to me as I let my car drip for quite a while after I pull the plug.