Thanks for the info. I would jump on this except the price makes it even harder for me to justify changing the oil myself. I'm already only saving a few bucks compared to finding a $25 oil change deal somewhere. And I have revhigh's concern as well; any debris on sitting on the oil pan will have a better chance getting flushed out with a higher drain flow rate.
But I do see the convenience of the valve. At the very least it'll be much cleaner. I always forget to put on rubber gloves and end up with hot used oil on my hands.