I have SD's on three cars and they work great. No leaks, no having to fiddle with a box wrench or socket, no problemos. The fitting & actuator attachment are well made; as for the rubber drain tube, I don't really use it when draining, so I don't know how that holds up over time. Yes, it does take a bit longer to drain the oil, but big whoop. And yes, a tiny bit less oil may drain from the pan due to the SD's design; again, big whoop...it's not like you ever drain all the oil out of an engine anyway.
It's the one Fram product I am a big fan of, especially as they can be had on Ebay for less than half the price of a Fumoto valve. Too bad Fram has discontinued them (though they still seem very easy to find on Ebay & Amazon).